diff --git "a/technology/test/questions.forum.tsv" "b/technology/test/questions.forum.tsv" new file mode 100644--- /dev/null +++ "b/technology/test/questions.forum.tsv" @@ -0,0 +1,2004 @@ +0 Why does man print gimme gimme gimme at 00:30? +1 What is the exact difference between a terminal, a shell, a tty and a console? +2 How do I get the size of a directory on the command line? +3 How to correctly add a path to PATH? +4 How to install a deb file, by dpkg -i or by apt? +5 How to copy files from one machine to another using ssh +6 How can I replace a string in a file(s)? +7 How to unfreeze after accidentally pressing Ctrl-S in a terminal? +8 Why was ~ chosen to represent the home directory? +9 How do I grep for multiple patterns with pattern having a pipe character? +10 What is the purpose of the lost+found folder in Linux and Unix? +11 How do I make `ls` show file sizes in megabytes? +12 Difference between nohup, disown and & +13 How to see full log from systemctl status service? +14 How to run find -exec? +15 Tracking down where disk space has gone on Linux? +16 What does -- (double-dash) mean? +17 How to cycle through reverse-i-search in BASH? +18 Why is printf better than echo? +19 How do I zip/unzip on the unix command line? +20 Preserve bash history in multiple terminal windows +21 How to switch between users on one terminal? +22 What do the numbers in a man page mean? +23 Zip all files in directory? +24 Why am I still getting a password prompt with ssh with public key authentication? +25 Using ${a:-b} for variable assignment in scripts +26 /usr/bin vs /usr/local/bin on Linux +27 Why is it better to use #!/usr/bin/env NAME instead of #!/path/to/NAME as my shebang? +28 Does curl have a --no-check-certificate option like wget? +29 Repeat a Unix command every x seconds forever +30 How can I reduce a videos size with ffmpeg? +31 What if kill -9 does not work? +32 Finding the PID of the process using a specific port? +33 How to force ssh client to use only password auth? +34 What is the difference between /opt and /usr/local? +35 Scroll inside Screen, or Pause Output +36 How to get execution time of a script effectively? +37 How can I resolve a hostname to an IP address in a Bash script? +38 How to display `top` results sorted by memory usage in real time? +39 How do I check package version using apt-get / aptitude? +40 Can I zip an entire folder using gzip? +41 How do I copy a folder keeping owners and permissions intact? +42 Turn off buffering in pipe +43 Can less retain colored output? +44 What is a bind mount? +45 How to forward X over SSH to run graphics applications remotely? +46 How to append multiple lines to a file +47 Execute vs Read bit. How do directory permissions in Linux work? +48 Can grep output only specified groupings that match? +49 recursive mkdir +50 How to conditionally do something if a command succeeded or failed +51 What is the difference between the Bash operators [[ vs [ vs ( vs ((? +52 Difference between Login Shell and Non-Login Shell? +53 How does reverse SSH tunneling work? +54 How do I remove a user from a group? +55 How do I delete a file whose name begins with - (hyphen a.k.a. dash or minus)? +56 Why not use which? What to use then? +57 When should I not kill -9 a process? +58 How can I pass a command line argument into a shell script? +59 refresh changed content of file opened in vi(m) +60 What does LC_ALL=C do? +61 What are the pros and cons of Vim and Emacs? +62 How do I use pushd and popd commands? +63 In Bash, when to alias, when to script, and when to write a function? +64 How can I run a command which will survive terminal close? +65 How to clear journalctl +66 Delete from cursor to end of line in `vi` +67 Using sed to find and replace +68 Get exit status of process thats piped to another +69 How do I loop through only directories in bash? +70 What is the difference between curl and wget? +71 How to copy a file from a remote server to a local machine? +72 How to generate a random string? +73 How can I find the implementations of Linux kernel system calls? +74 Ctrl-s hangs the terminal emulator? +75 How to do integer & float calculations, in bash or other languages/frameworks? +76 How to check OS and version using a Linux command +77 How do you empty the buffers and cache on a Linux system? +78 How can I prevent grep from showing up in ps results? +79 finds -exec rm {} \; vs -delete +80 How can I use sed to replace a multi-line string? +81 What are the shells control and redirection operators? +82 How can I find broken symlinks +83 Compress a folder with tar? +84 How can I delete all lines in a file using vi? +85 What characters do I need to escape when using sed in a sh script? +86 Remove all files/directories except for one file +87 Why does my shell script choke on whitespace or other special characters? +88 What DNS servers am I using? +89 How do I set my DNS when resolv.conf is being overwritten? +90 How can I get the size of a file in a bash script? +91 Does curl have a timeout? +92 In a bash script, using the conditional or in an if statement +93 What is the fastest way to view images from the terminal? +94 GPU usage monitoring (CUDA) +95 How to get over device or resource busy? +96 How can I monitor disk io? +97 Specify identity file (id_rsa) with rsync +98 How do I clear Bashs cache of paths to executables? +99 How to list all files ordered by size +100 Whats the story behind Super Cow Powers? +101 What does rc in .bashrc stand for? +102 How to set default file permissions for all folders/files in a directory? +103 Count total number of occurrences using grep +104 How can I get my external IP address in a shell script? +105 How to get the pid of the last executed command in shell script? +106 How to list keys added to ssh-agent with ssh-add? +107 Is it possible to see cp speed and percent copied? +108 How to colorize output of git? +109 Copy a file back to local system with ssh +110 How to split the terminal into more than one view? +111 Hide curl output +112 How to view the output of a running process in another bash session? +113 How can I run ssh-add automatically, without a password prompt? +114 How to define tab delimiter with cut in BASH? +115 How to have tail -f show colored output +116 What do the fields in ls -al output mean? +117 What is the difference between `grep`, `egrep`, and `fgrep`? +118 How to know number of cores of a system in Linux? +119 How to permanently set environmental variables +120 How can I instruct yum to install a specific version of package X? +121 How can I test if a variable is empty or contains only spaces? +122 How do I change the extension of multiple files? +123 Write all tmux scrollback to a file +124 How to remove a single line from history? +125 Colorizing your terminal and shell environment? +126 Whats the difference between $(stuff) and `stuff`? +127 Prepending a timestamp to each line of output from a command +128 How do I equally balance tmux(1) split panes? +129 Better colors so comments arent dark blue in Vim? +130 What should/shouldnt go in .zshenv, .zshrc, .zlogin, .zprofile, .zlogout? +131 How can I get a count of files in a directory using the command line? +132 How to check how long a process has been running? +133 Moving tmux pane to window +134 How to know whether Wayland or X11 is being used +135 Why doesnt my Bash script recognize aliases? +136 How does a Segmentation Fault work under-the-hood? +137 List available updates but do not install them +138 How to avoid being asked passphrase each time I push to Bitbucket +139 What are the differences between most, more and less? +140 What is the real difference between apt-get and aptitude? (How about wajig?) +141 How do I set an environment variable on the command line and have it appear in commands? +142 How can I make Press any key to continue +143 How do I find out what hard disks are in the system? +144 How do I trim leading and trailing whitespace from each line of some output? +145 Whats the point in adding a new line to the end of a file? +146 How to terminate a background process? +147 Keep processes running after SSH session disconnects +148 Convince apt-get *not* to use IPv6 method +149 What is the eval command in bash? +150 How to reload udev rules without reboot? +151 How to know if a disk is an SSD or an HDD +152 How to go to the previous working directory in terminal? +153 Change the Python3 default version in Ubuntu +154 How to write startup script for Systemd? +155 Most efficient method to empty the contents of a file +156 View stdout/stderr of systemd service +157 How can I update to a newer version of Git using apt-get? +158 How can I get the current working directory? +159 How to monitor CPU/memory usage of a single process? +160 Can rsync resume after being interrupted? +161 Multiple similar entries in ssh config +162 Sort and count number of occurrence of lines +163 Whats ssh port forwarding and whats the difference between ssh local and remote port forwarding +164 Recursively delete all files with a given extension +165 How do I convert an epoch timestamp to a human readable format on the cli? +166 How to display meminfo in megabytes in top? +167 Where did the wheel group get its name? +168 Why *not* parse `ls` (and what to do instead)? +169 Why is FreeBSD deprecating GCC in favor of Clang/LLVM? +170 how can I make cron run a job right now, for testing/debugging? without changing the schedule! +171 Kernel inotify watch limit reached +172 How to create a new window on the current directory in tmux? +173 What does env x=() { :;}; command bash do and why is it insecure? +174 What is `^M` and how do I get rid of it? +175 How can I send stdout to multiple commands? +176 Delete the last character of a string using string manipulation in shell script +177 How to tell gzip to keep original file? +178 How create a temporary file in shell script? +179 What do the flags in /proc/cpuinfo mean? +180 SSH tunneling error: channel 1: open failed: administratively prohibited: open failed +181 Why is using a shell loop to process text considered bad practice? +182 Security implications of forgetting to quote a variable in bash/POSIX shells +183 How to import secret gpg key (copied from one machine to another)? +184 How to add a newline to the end of a file? +185 Difference between 2>&-, 2>/dev/null, |&, &>/dev/null and >/dev/null 2>&1 +186 How do you sort du output by size? +187 Efficiently delete large directory containing thousands of files +188 Can I create a user-specific hosts file to complement /etc/hosts? +189 Why do I need a tty to run sudo if I can sudo without a password? +190 Get file created/creation time? +191 How can get a list of all scheduled cron jobs on my machine? +192 Linux top command: What are us, sy, ni, id, wa, hi, si and st (for CPU usage)? +193 How can I get distribution name and version number in a simple shell script? +194 Why does `htop` show more process than `ps` +195 List all connected SSH sessions? +196 What is the meaning of IFS=$\n in bash scripting? +197 What is the purpose of .bashrc and how does it work? +198 redirecting to /dev/null +199 How to suspend and bring a background process to foreground +200 How to change where a symlink points +201 Why is ls suddenly wrapping items with spaces in single quotes? +202 Execute a command once per line of piped input? +203 What makes grep consider a file to be binary? +204 Why are tar archive formats switching to xz compression to replace bzip2 and what about gzip? +205 Cant resume screen, says I am already attached? +206 how can I recursively delete empty directories in my home directory? +207 Can I remove files in /var/log/journal and /var/cache/abrt-di/usr? +208 Allow setuid on shell scripts +209 Difference between cp -r and cp -a +210 What does aux mean in `ps aux`? +211 What does ` (backquote/backtick) mean in commands? +212 How do I make my pc speaker beep +213 Getting 256 colors to work in tmux +214 Find command: how to ignore case? +215 Find where inodes are being used +216 How can I calculate the size of a directory? +217 Find out current working directory of a running process? +218 VISUAL vs. EDITOR – what’s the difference? +219 How to determine where an environment variable came from? +220 Unzipping a .gz file without removing the gzipped file +221 What does etc stand for? +222 What do options `ServerAliveInterval` and `ClientAliveInterval` in sshd_config do exactly? +223 What is the working directory when cron executes a job? +224 How can I display the contents of a text file on the command line? +225 How can I edit multiple files in VIM? +226 Any reason NOT to run Linux in a VM all the time? +227 Is there a one-liner that allows me to create a directory and move into it at the same time? +228 umount: device is busy. Why? +229 Extract only a specific file from a zipped archive to a given directory +230 scp without replacing existing files in the destination +231 Markdown Viewer +232 Terminal prompt not wrapping correctly +233 linux: How can I view all UUIDs for all available disks on my system? +234 How do I get the MD5 sum of a directorys contents as one sum? +235 What causes this green background in ls output? +236 How to fill 90% of the free memory? +237 Find the total size of certain files within a directory branch +238 How to use find command to search for multiple extensions +239 How to install Desktop Environments on CentOS 7? +240 Whats the difference between /sbin/nologin and /bin/false +241 There are stopped jobs (on bash exit) +242 How to rsync only new files +243 Limit memory usage for a single Linux process +244 How can I grep in PDF files? +245 How to move and overwrite subdirectories (and files) to parent directory? +246 How to run a specific program as root without a password prompt? +247 How to get the complete and exact list of mounted filesystems in Linux? +248 Where are cron errors logged? +249 Why do we use su - and not just su? +250 delete line in vi +251 How to scroll in a terminal using keyboard? +252 Is Linux a Unix? +253 What is the difference between Docker, LXD, and LXC +254 tmux vs. GNU Screen +255 Where are Apache file access logs stored? +256 How to delete directories based on `find` output? +257 Whats the difference between semicolon and double ampersand && +258 Do the parent directorys permissions matter when accessing a subdirectory? +259 Merging folders with mv? +260 The proper way to test if a service is running in a script +261 Failed to fetch jessie backports repository +262 Can grep return true/false or are there alternative methods +263 How can I populate a file with random data? +264 Why is looping over finds output bad practice? +265 How to recursively find the amount stored in directory? +266 Passing named arguments to shell scripts +267 How do you move all files (including hidden) from one directory to another? +268 How can I delete a word backward at the command line (bash and zsh)? +269 How to skip permission denied errors when running find in Linux? +270 Is your SSH password revealed when you attempt to connect to the wrong server? +271 How can I set vi as my default editor in UNIX? +272 What are the pros/cons of Upstart and systemd? +273 Run a command that is shadowed by an alias +274 Combined `mkdir` and `cd`? +275 How can I see dmesg output as it changes? +276 Looping through files with spaces in the names? +277 How to use wildcards (*) when copying with scp? +278 How to remove all empty directories in a subtree? +279 Delete files older than X days + +280 $VAR vs ${VAR} and to quote or not to quote +281 ifconfig command not found +282 ssh-add complains: Could not open a connection to your authentication agent +283 How to debug a bash script? +284 How do I remove a directory and all its contents? +285 Timezone setting in Linux +286 Sort based on the third column +287 Copy text from one tmux pane to another (using vim) +288 What are the pros/cons of deb vs. rpm? +289 How to check if a shell is login/interactive/batch +290 Move folder content up one level +291 Open `less` scrolled to the end +292 Batch renaming files +293 How can I disown a running process and associate it to a new screen shell? +294 ssh-add is not persistent between reboots +295 do changes in /etc/security/limits.conf require a reboot? +296 Parallelize a Bash FOR Loop +297 Pass the output of previous command to next as an argument +298 tar: Removing leading `/ from member names +299 How to clean log file? +300 Script to monitor folder for new files? +301 How to suspend and resume processes +302 Rsync filter: copying one pattern only +303 How can I add a signature .png to a PDF in Linux? +304 Simple command line HTTP server +305 How to copy-merge two directories? +306 How can I wrap text at a certain column size? +307 Can I redirect output to a log file and background a process at the same time? +308 What does <<< mean? +309 Are there naming conventions for variables in shell scripts? +310 Creating diagrams in ASCII +311 How to put current line at top/center/bottom of screen in vim? +312 Trying to SSH to local VM Ubuntu with Putty +313 remove particular characters from a variable using bash +314 Is CentOS exactly the same as RHEL? +315 What is the purpose of using shift in shell scripts? +316 What color codes can I use in my PS1 prompt? +317 How do I determine the number of RAM slots in use? +318 Quoting within $(command substitution) in Bash +319 Precedence of the shell logical operators &&, || +320 Is there an easy way to replace duplicate files with hardlinks? +321 I deleted /bin/rm. How do I recover it? +322 Why would someone choose FreeBSD over Linux? +323 List files sorted numerically +324 Executing chdir before starting systemd service +325 What is the point of Ctrl-S? +326 How to list disks, partitions and filesystems in Linux? +327 Viewing all iptables rules +328 cat line X to line Y on a huge file +329 How do you extract a single folder from a large tar.gz archive? +330 How to remove duplicate lines inside a text file? +331 Whats the difference between a normal user and a system user? +332 In CentOS, what is the difference between yum update and yum upgrade? +333 How to redirect output of wget as input to unzip? +334 Human readable memory sizes in top? +335 Renumbering windows in tmux +336 Unix/Linux undelete/recover deleted files +337 How do I write a retry logic in script to keep retrying to run it upto 5 times? +338 How to extract specific file(s) from tar.gz +339 Copy specific file type keeping the folder structure +340 Easily unpack DEB, edit postinst, and repack DEB +341 How to stop the find command after first match? +342 Using the not equal operator for string comparison +343 Good detailed explanation of /etc/network/interfaces syntax? +344 How can I execute `date` inside of a cron tab job? +345 How to find out from the logs what caused system shutdown? +346 Is there a way to dynamically refresh the less command? +347 How to make `sudo` preserve $PATH? +348 How to choose directory name during untarring +349 How to chmod without /usr/bin/chmod? +350 What does >/dev/null 2>&1 mean in this article of crontab basics? +351 How to uppercase the command line argument? +352 How to enable diffie-hellman-group1-sha1 key exchange on Debian 8.0? +353 Finding all large files in the root filesystem +354 How do I grep recursively through .gz files? +355 Is there a way to redirect nohup output to a log file other than nohup.out? +356 How big is the pipe buffer? +357 Bash: What does >| do? +358 Return only the portion of a line after a matching pattern +359 How do I set a user environment variable? (permanently, not session) +360 Linux: Difference between /dev/console , /dev/tty and /dev/tty0 +361 How do I remove the first 300 million lines from a 700 GB txt file on a system with 1 TB disk space? +362 Temporarily suspend bash_history on a given shell? +363 What to do when a Linux desktop freezes? +364 Sorting down processes by memory usage +365 How does the sticky bit work? +366 Zip the contents of a folder without including the folder itself +367 Run a command without making me wait +368 Using sed to find and replace complex string (preferrably with regex) +369 GUI for GIT similar to SourceTree +370 Where do executables look for shared objects at runtime? +371 What is the difference between /tmp and /var/tmp? +372 Determine the size of a block device +373 Why is number of open files limited in Linux? +374 How can I have `date` output the time from a different timezone? +375 no public key available on apt-get update +376 How to download portion of video with youtube-dl command? +377 How to start tmux with attach if a session exists +378 How is Mono magical? +379 How to uncompress zlib data in UNIX? +380 How do I do a ls and then sort the results by date created? +381 How can I move files and view the progress (e.g. with a progress bar)? +382 Is it possible to find out the hosts in the known_hosts file? +383 How do I read from /proc/$pid/mem under Linux? +384 Why does find -mtime +1 only return files older than 2 days? +385 How do I add X days to date and get new date? +386 Why use swap when there is more than enough free space in RAM? +387 Fix terminal after displaying a binary file +388 Determine if Git working directory is clean from a script +389 How does systemd use /etc/init.d scripts? +390 How do I know if dd is still working? +391 Generate File of a certain size? +392 What is the difference between modify and change in stat command context? +393 Is there any way to execute commands from history? +394 Make all new files in a directory accessible to a group +395 What exactly is POSIX? +396 Too many levels of symbolic links +397 How to run a program in a clean environment in bash? +398 Split string by delimiter and get N-th element +399 Delete First line of a file +400 How to add repository from shell in Debian? +401 List only regular files (but not directories) in current directory +402 How to redirect output to a file from within cron? +403 What is the Fedora equivalent of the Debian build-essential package? +404 In Arch Linux how can I find out which package to install that will contain file X? +405 Copy-Paste in xfce4-terminal adds 0~ and 1~ +406 What does the @ mean in ls -l? +407 How to make a machine accessible from the LAN using its hostname +408 What is the difference between sort -u and sort | uniq? +409 How can I check if swap is active from the command line? +410 locate vs find: usage, pros and cons of each other +411 What does the .d stand for in directory names? +412 How to create nested directory in a single command? +413 Cant use exclamation mark (!) in bash? +414 How to find applications path from command line? +415 How can I count the number of lines of a file with common tools? +416 How do I delete the first n lines of an ascii file using shell commands? +417 How do I limit the number of files printed by ls? +418 When is double-quoting necessary? +419 dd vs cat -- is dd still relevant these days? +420 How do I unset a variable at the command line? +421 What does ampersand mean at the end of a shell script line? +422 Automated ssh-keygen without passphrase, how? +423 How to disable auto suspend when I close laptop lid? +424 Can I configure my Linux system for more aggressive file system caching? +425 Whats the recommended way of copying changes with vimdiff? +426 How to get only files created after a date with ls? +427 How can I run a cron command with existing environmental variables? +428 How can I execute local script on remote machine and include arguments? +429 Understanding of diff output +430 diff within a line +431 How to determine Linux kernel architecture? +432 Mount cifs Network Drive: write permissions and chown +433 What is a Superblock, Inode, Dentry and a File? +434 How do SO (shared object) numbers work? +435 Can I watch the progress of a `sync` operation? +436 how can I add (subtract, etc.) two numbers with bash? +437 Find and remove large files that are open but have been deleted +438 The myths about malware in Unix / Linux +439 Where should I put software I compile myself? +440 Have backticks (i.e. `cmd`) in *sh shells been deprecated? +441 How to move all files and folders via mv command +442 How can I fix cannot find a valid baseurl for repo errors on CentOS? +443 Usage of dash (-) in place of a filename +444 Exit vim more quickly +445 Clone ownership and permissions from another file? +446 When is xargs needed? +447 Why does Vim indent pasted code incorrectly? +448 Convince grep to output all lines, not just those with matches +449 How to combine 2 -name conditions in find? +450 date command --iso-8601 option +451 How to see process created by specific user in Unix/linux +452 How do I repeat the last command without using the arrow keys? +453 Get the chmod numerical value for a file +454 How to remove an audio track from an mp4 video file? +455 How to XZ a directory with TAR using maximum compression? +456 How to export variables from a file? +457 Bluetooth Pairing on Dual Boot of Windows & Linux Mint/Ubuntu - Stop having to Pair Devices +458 Keyboard set to cat mode +459 How to kill a runaway cat? +460 How to monitor only the last n lines of a log file? +461 Can scp create a directory if it doesnt exist? +462 Why are hard links to directories not allowed in UNIX/Linux? +463 Bash - how to run a command after the previous finished? +464 Manually generate password for /etc/shadow +465 Download using wget to a different directory than current directory +466 grep returns Binary file (standard input) matches when trying to find a string pattern in file +467 Combine the output of two commands in bash +468 Use scp to transfer a file from local directory X to remote directory Y +469 Pass command line arguments to bash script +470 How to make log-rotate change take effect +471 chroot jail - what is it and how do I use it? +472 Why is cd not a program? +473 What does the Broken pipe message mean in an SSH session? +474 Difference between pts and tty +475 How can I do a change word in Vim using the current paste buffer? +476 apache2 Invalid command SSLEngine +477 How to apt-delete-repository? +478 Any way to encode the url in curl command? +479 Trying to sort on two fields, second then first +480 How do I find on which physical device a folder is located? +481 How do we specify multiple ignore patterns for `tree` command? +482 Show top five CPU consuming processes with `ps` +483 File permission issues with shared folders under Virtual Box (Ubuntu Guest, Windows Host) +484 Decoding URL encoding (percent encoding) +485 Where do I put my systemd unit file? +486 Why isnt Linux embraced as the official GNU kernel? +487 How to comment multiple lines at once? +488 The name > org.freedesktop.PolicyKit1 was not provided by any .service files +489 Zip everything in current directory +490 A standard tool to convert a byte-count into human KiB MiB etc; like du, ls1 +491 How to merge all (text) files in a directory into one? +492 Where is bashs history stored? +493 How to determine CentOS version? +494 Whats the meaning of a dot before a command in shell? +495 How do you detach the 2nd screen from within another screen? +496 How does Linux handle multiple consecutive path separators (/home////username///file)? +497 Where do files go when the rm command is issued? +498 How do I know if a partition is ext2, ext3, or ext4? +499 Understanding the exclamation mark (!) in bash +500 When to use /dev/random vs /dev/urandom +501 Can I export functions in bash? +502 What is the purpose of the hash command? +503 Which is the safest way to get root privileges: sudo, su or login? +504 Replace string in a huge (70GB), one line, text file +505 How do I attach a terminal to a detached process? +506 Is there a tool to get the lines in one file that are not in another? +507 How can I set my default shell to start up tmux +508 How to do I convert an animated gif to an mp4 or mv4 on the command line? +509 Throttle the download speed of wget or curl while downloading +510 Quick directory navigation in the bash shell +511 Why are there so many different ways to measure disk usage? +512 Is there a way to see details of all the threads that a process has in Linux? +513 -bash: sudo: command not found +514 How can I find the hardware model in Linux? +515 How can I communicate with a Unix domain socket via the shell on Debian Squeeze? +516 How does the OOM killer decide which process to kill first? +517 What is the difference between && and ; when chaining commands +518 What does the @ (at) symbol mean on OSX ls? +519 With the Linux cat command, how do I show only certain lines by number +520 Adding a self-signed certificate to the trusted list +521 Download only format mp4 on youtube-dl +522 Do parentheses really put the command in a subshell? +523 Is there a .bashrc equivalent file read by all shells? +524 Attach to different windows in session +525 Username is not in the sudoers file. This incident will be reported +526 Argument string to integer in bash +527 How to find out the dynamic libraries executables loads when run? +528 How to install Python 3.6? +529 Cause a script to execute after networking has started? +530 Redirecting stdout to a file you dont have write permission on +531 How can I tell what version of Linux Im using? +532 Day of week {0-7} in crontab has 8 options, but we have only 7 days in a week +533 Getting tmux to copy a buffer to the clipboard +534 Easy way to determine the virtualization technology of a Linux machine? +535 What are other ways to share a tmux session between two users? +536 How to do a `tail -f` of log rotated files? +537 How to connect to a serial port as simple as using SSH? +538 How to copy all files from a directory to a remote directory using scp? +539 How to get full path of original file of a soft symbolic link? +540 How can I use ffmpeg to split MPEG video into 10 minute chunks? +541 Is there a way to get the min, max, median, and average of a list of numbers in a single command? +542 What is the need for `fakeroot` command in linux +543 List packages on an apt based system by installation date +544 How do I remotely edit files via ssh? +545 Pseudo files for temporary data +546 What does the Windows flag in the Linux logo of kernel 3.11 mean? +547 What is yum equivalent of apt-get update? +548 Kill an unresponsive ssh session without closing the terminal +549 When was the shellshock (CVE-2014-6271/7169) bug introduced, and what is the patch that fully fixes it? +550 How to find creation date of file? +551 What is the difference between reboot , init 6 and shutdown -r now? +552 Copy the contents of a file into the clipboard without displaying its contents +553 How do I pass a list of files to grep +554 How to grep standard error stream (stderr)? +555 What are pseudo terminals (pty/tty)? +556 How to run a command without hitting Enter Key? +557 Why is echo so much faster than touch? +558 ssh_exchange_identification: read: Connection reset by peer +559 How to show the filesystem type via the terminal? +560 bash - replace space with new line +561 If you ^Z from a process, it gets stopped. How do you switch back in? +562 Forward SIGTERM to child in Bash +563 Why is swappiness set to 60 by default? +564 Cron vs systemd timers +565 difference between function foo() {} and foo() {} +566 Confusing use of && and || operators +567 Get SSH server key fingerprint +568 Recursive glob? +569 What is the difference between $* and $@? +570 ^x^y unix trick for all instances in last command? +571 mount: wrong fs type, bad option, bad superblock +572 How do I clear the terminal History? +573 Quickly calculate date differences +574 List partition labels from the command line +575 GPT or MBR: How do I know? +576 Sorting the output of find -print0 by piping to the sort command +577 How can I start the python SimpleHTTPServer on port 80? +578 How do I find how long ago a Linux system was installed? +579 Difference between /bin and /usr/bin +580 Why is the Linux kernel 15+ million lines of code? +581 How are /dev Linux files created? +582 How to follow links in linux man pages? +583 On what systems is //foo/bar different from /foo/bar? +584 How to open rar file in linux? +585 SSH Key Permissions chmod settings? +586 How do I kill all screens? +587 How to run grep with multiple AND patterns? +588 Getting new files to inherit group permissions on Linux +589 last time file opened +590 How to check if there are no parameters provided to a command? +591 How to sync two folders with command line tools? +592 gpg: keyserver receive failed: No dirmngr +593 Why is video tearing such a problem in Linux? +594 Understanding the output of --info=progress2 from rsync +595 What is the fastest way to send massive amounts of data between two computers? +596 If Linux is only a kernel, then how were its first versions used (without distribution)? +597 Why is there no Euro English locale? +598 ssh_exchange_identification: Connection closed by remote host (not using hosts.deny) +599 How to output only file names (with spaces) in ls -Al? +600 Unable to locate package `docker-ce` on a 64bit ubuntu +601 Writing basic systemd service files +602 How to copy text from vim to an external program? +603 What is a tainted kernel in Linux? +604 What is this folder /run/user/1000? +605 Understanding the -exec option of `find` +606 Why is /dev/null a file? Why isnt its function implemented as a simple program? +607 timestamp, modification time, and created time of a file +608 Why do we need to fork to create new processes? +609 Whats the most appropriate directory where to place files shared between users? +610 Does tail read the whole file? +611 Create a symbolic link relative to the current directory +612 How can I monitor all outgoing requests/connections from my machine? +613 How to compare two dates in a shell? +614 How to insert text before the first line of a file? +615 rm -rf all files and all hidden files without . & .. error +616 Why is my ethernet interface called enp0s10 instead of eth0? +617 Reserved space for root on a filesystem - why? +618 Why does argv include the program name? +619 Error using SCP: not a regular file +620 How to escape quotes in shell? +621 Shell scripting: -z and -n options with if +622 exit tmux window without quitting the Terminal program +623 What is mail, and how is it navigated? +624 How can I remove the BOM from a UTF-8 file? +625 Which installed software packages use the most disk space on Debian? +626 How do you do a dry run of rm to see what files will be deleted? +627 How to use watch command with a piped chain of commands/programs +628 Watch YouTube videos in terminal +629 How to renew an expired keypair with gpg +630 Is Vim immune to copy-paste attack? +631 SSH login with clear text password as a parameter? +632 Why do we use ./ (dot slash) to execute a file in Linux/UNIX? +633 What is /usr/local/bin? +634 In linux, how to delete all files EXCEPT the pattern *.txt? +635 How to export a GPG private key and public key to a file +636 Why doesnt grep ignore binary files by default? +637 What does the (!) mean after uptime on htop +638 Vi vs vim, or, is there any reason why I would ever want to use vi? +639 How to shrink root filesystem without booting a livecd +640 What are high memory and low memory on Linux? +641 Command line: How do you rotate a PDF file 90 degrees? +642 How can I find out which users are in a group within Linux? +643 Simple way to create a tunnel from one local port to another? +644 Does the shebang determine the shell which runs the script? +645 What is the benefit of compiling your own linux kernel? +646 How to unzip a multipart (spanned) ZIP on Linux? +647 Disable a users login without disabling the account +648 Creating a GIF animation from PNG files +649 What is the difference between Halt and Shutdown commands? +650 tput setaf color table? How to determine color codes? +651 In what order do piped commands run? +652 How to insert text after a certain string in a file? +653 How can I restart the SSH daemon on Ubuntu? +654 How to count the number of a specific character in each line? +655 How do I display log messages from previous boots under CentOS 7? +656 How to rsync over ssh when directory names have spaces +657 Is it possible to run ssh-copy-id on port other than 22? +658 Is there a basic tutorial for grep, awk and sed? +659 Does sort support sorting a file in-place, like `sed --in-place`? +660 Process substitution and pipe +661 Match exact string using grep +662 How to create SHA512 password hashes on command line +663 What does systemctl daemon-reload do? +664 Uploading directories with sftp? +665 Generate random numbers in specific range +666 How to dd a remote disk using SSH on local machine and save to a local disk +667 Is there any option with ls command that I see only the directories? +668 How can I install the `ll` command on Mac OS X? +669 How do I know which version of Debian Im running? +670 Does `sl` ever show the current directory? +671 How to find which processes are taking all the memory? +672 what is the CentOS equivalent of /var/log/syslog (on Ubuntu)? +673 Determining what process is bound to a port +674 How do I find out which processes are preventing unmounting of a device? +675 How to update Linux locate cache +676 Where should a local executable be placed? +677 Command-line completion from command history +678 su vs sudo -s vs sudo -i vs sudo bash +679 What happens when you mount over an existing folder with contents? +680 Why ZSH ends a line with a highlighted percent symbol? +681 Why does parameter expansion with spaces without quotes work inside double brackets [[ but not inside single brackets [? +682 Why is there a big delay after entering a wrong password? +683 What is the difference between cat file | ./binary and ./binary < file? +684 How to grep lines which does not begin with # or ;? +685 What is the difference between -m conntrack --ctstate and -m state --state +686 Why is root login via SSH so bad that everyone advises to disable it? +687 tmux status-bar corrupted after catting a binary file, how to reset? +688 How do keyboard input and text output work? +689 How can I make a script in /etc/init.d start at boot? +690 How to determine the filesystem of an unmounted device? +691 Setting /proc/sys/vm/drop_caches to clear cache +692 How to get keycodes for xmodmap? +693 Sorting files according to size recursively +694 What do the scripts in /etc/profile.d do? +695 How can we run a command stored in a variable? +696 How can I create a message box from the command line? +697 What are the systemctl options to List all failed units +698 ulimit: difference between hard and soft limits +699 Search for a previous command with the prefix I just typed +700 convert webp to jpg error: no decode delegate for this image format and missing an image filename +701 Remember a half-typed command while I check something +702 List of available services +703 Error when trying to connect to bluetooth speaker: `org.bluez.Error.Failed` +704 How to add newlines into variables in bash script +705 tmux bottom bar color change +706 determining path to sourced shell script +707 Find duplicate files +708 What does it mean to have a $dollarsign-prefixed string in a script? +709 Detect init system using the shell +710 Why eval the output of ssh-agent? +711 Why would I tar a single file? +712 Command to list PostgreSQL user accounts? +713 Set volume from terminal +714 How to print only the duplicate values from a text file? +715 Why is the root directory on a web server put by default in /var/www? +716 On-the-fly monitoring HTTP requests on a network interface? +717 Create a tar archive split into blocks of a maximum size +718 Is Mac OS X UNIX? +719 How do I use cut to separate by multiple whitespace? +720 Chrome: DNS requests with random DNS names: malware? +721 Whats the purpose of the randomart image for user (not host) SSH keys? +722 Does cd . have use? +723 How to check which GPU is active in Linux? +724 How to solve the issue that a Terminal screen is messed up? (usually after a resizing) +725 Convert file contents to lower case +726 How to install dig on CentOS? +727 How does tcp-keepalive work in ssh? +728 How can I keep my SSH sessions from freezing? +729 How to pass parameters to an alias? +730 Long line wrapping in Nano +731 Why can rm remove read-only files? +732 How do you use output redirection in combination with here-documents and cat? +733 How to make tmux count windows starting from 1 instead of 0? +734 How can I find available network interfaces? +735 tar --exclude doesnt exclude. Why? +736 Multiline shell script comments - how does this work? +737 How to copy the partition layout of a whole disk using standard tools +738 What are correct permissions for /tmp ? I unintentionally set it all public recursively +739 Press space to continue +740 What is the difference between ~/.profile and ~/.bash_profile? +741 Whats the difference between eval and exec? +742 Birth is empty on ext4 +743 How do you use the command coproc in various shells? +744 How to ssh to remote server using a private key? +745 What is the right file permission for a .pem file to SSH and SCP +746 su options - running command as another user +747 grep on a variable +748 How can I look up a username by id in linux? +749 What technical details should a programmer of a web application consider before making the site public? +750 Which hashing algorithm is best for uniqueness and speed? +751 Where did the notion of one return only come from? +752 Im graduating with a Computer Science degree but I dont feel like I know how to program +753 What is the single most effective thing you did to improve your programming skills? +754 My boss decided to add a person to blame field to every bug report. How can I convince him that its a bad idea? +755 How to respond when you are asked for an estimate? +756 Why is 80 characters the standard limit for code width? +757 So Singletons are bad, then what? +758 Is the use of utf8=✓ preferable to utf8=true? +759 What is the Mars Curiosity Rovers software built in? +760 Pros and Cons of Facebooks React vs. Web Components (Polymer) +761 Why cant the IT industry deliver large, faultless projects quickly as in other industries? +762 Is it OK to have multiple asserts in a single unit test? +763 Ive inherited 200K lines of spaghetti code -- what now? +764 Overcoming slow problem solving due to increased knowledge of what might go wrong +765 My customer wants me to record a video of how I develop his software product +766 How accurate is Business logic should be in a service, not in a model? +767 Should UTF-16 be considered harmful? +768 Im a manager. How can I improve work relationships and communication with programmers? +769 How do I create my own programming language and a compiler for it +770 Should I intentionally break the build when a bug is found in production? +771 Why do game developers prefer Windows? +772 What does stage mean in git? +773 Why is Global State so Evil? +774 Why isnt Java used for modern web application development? +775 I dont program in my spare time. Does that make me a bad developer? +776 Im doing 90% maintenance and 10% development, is this normal? +777 Should I keep my GitHub forked repositories around forever? +778 How would you know if youve written readable and easily maintainable code? +779 How should I behave as a developer in a project thats headed for failure? +780 What is negative code? +781 Should you write your back-end as an API? +782 Is 4-5 years the “Midlife Crisis” for a programming career? +783 Why do business analysts and project managers get higher salaries than programmers? +784 Why are there no PUT and DELETE methods on HTML forms? +785 When should you call yourself a senior developer? +786 What software programming languages were used by the Soviet Unions space program? +787 When is a BIG Rewrite the answer? +788 Why are shortcuts like x += y considered good practice? +789 Should curly braces appear on their own line? +790 Im a Subversion geek, why should I consider or not consider Mercurial or Git or any other DVCS? +791 Should I return from a function early or use an if statement? +792 How Can I Know Whether I Am a Good Programmer? +793 Why does everyone use Git in a centralized manner? +794 What does SVN do better than Git? +795 Is there any reason to use the var keyword in ES6? +796 Grokking Java culture - why are things so heavy? What does it optimize for? +797 Do I need to use an interface when only one class will ever implement it? +798 Should package names be singular or plural? +799 Are #regions an antipattern or code smell? +800 Why are people making tables with divs? +801 Why dont all companies buy developers the best hardware? +802 Does using == in JavaScript ever make sense? +803 How do you know youre writing good code? +804 Leaving intentional bugs in code for testers to find +805 Why have private fields, isnt protected enough? +806 Aggregation vs Composition +807 Should we avoid object creation in Java? +808 Choosing between Single or multiple projects in a git repository? +809 How do you tell if advice from a senior developer is bad? +810 Why squash git commits for pull requests? +811 How to write a very basic compiler +812 What does the Spring framework do? Should I use it? Why or why not? +813 How do you unit test private methods? +814 How are globals any different from a database? +815 How can I deal with the cargo-cult programming attitude? +816 Perks for new programmers +817 Is premature optimization really the root of all evil? +818 Can I use GPL software in a commercial application +819 If immutable objects are good, why do people keep creating mutable objects? +820 What is the difference between writing test cases for BDD and TDD? +821 Whats wrong with comments that explain complex code? +822 What should every programmer know? +823 Why do dynamic languages make it more difficult to maintain large codebases? +824 Project is nearly done, but procedural spaghetti code. Do I rewrite or just keep trying to ship it? +825 Should images be stored in a git repository? +826 Why was Tanenbaum wrong in the Tanenbaum-Torvalds debates? +827 Torvalds quote about good programmer +828 Will high reputation in Stack Overflow help to get a good job? +829 How can a code editor effectively hint at code nesting level - without using indentation? +830 Why do many exception messages not contain useful details? +831 Why do ads for s/w engineers always say they offer a fast-paced environment? +832 Why do we need private variables? +833 Is it wrong to use a boolean parameter to determine behavior? +834 Python file naming convention? +835 Why do people hesitate to use Python 3? +836 Why shouldnt I use the repository pattern with Entity Framework? +837 New developer cant keep up with branch merges +838 Are `break` and `continue` bad programming practices? +839 Why use a database instead of just saving your data to disk? +840 Is it a bad practice to store large files (10 MB) in a database? +841 Strategy for keeping secret info such as API keys out of source control? +842 Is it normal to spend as much, if not more, time writing tests than actual code? +843 Is there a name for the (anti- ) pattern of passing parameters that will only be used several levels deep in the call chain? +844 Why is naming a tables Primary Key column Id considered bad practice? +845 How much should I be using let vs const in ES6? +846 New Team Lead - How to deal with a resentful former peer +847 How do I prevent Scrum from turning great developers into average developers? +848 Why do we need so many classes in design patterns? +849 AGPL - what you can do and what you cant +850 Is it good practice to always have an autoincrement integer primary key? +851 Why arent more desktop apps written with Qt? +852 Whats the canonical retort to its open source, submit a patch? +853 What is MVC, really? +854 How can one manage thousands of IF...THEN...ELSE rules? +855 Never do in code what you can get the SQL server to do well for you - Is this a recipe for a bad design? +856 What exactly makes the Haskell type system so revered (vs say, Java)? +857 When do you use float and when do you use double +858 Do we really need OO languages to manage software complexity? +859 My boss asks me to stop writing small functions and do everything in the same loop +860 Why doesnt HTTP have POST redirect? +861 Is it bad practice to use