nl_command
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Find all .rb and .yml files in the /some/path directory tree and replace "some_phrase" with "replacement_phrase" in them | find /some/path -name "*rb" -o -name "*yml" | xargs grep -sl "some_phrase" | xargs sed -i -e 's/some_phrase/replacement_phrase/g' |
List all files in /var/www and below that have changed in the last 10 minutes | find /var/www -cmin -10 -printf "%c %pn" |
Search the /tmp tree for files between 10kb and 20kb | find /tmp -size +10k -size -20k |
Find all files that are set user ID to root | find . -user root -perm -4000 -print |
Find all hidden (regular) files under /tmp | find /tmp -type f -name ".*" |
Write "suspend" to standard output and to file "/sys/bus/usb/devices/usb3/power/level" | echo suspend | sudo tee /sys/bus/usb/devices/usb3/power/level |
Find all directories under 'test' directory tree that match the regex '[course*]' in their paths | find test -regex "[course*]" -type d |
Gets IP address of 'en0' selected network interface. | ifconfig en0 | awk '/inet addr/ {gsub("addr:", "", $2); print $2}' |
Search the home directory tree for video files | find ~ -type f -name '*.mkv' -o -name '*.mp4' -o -name '*.wmv' -o -name '*.flv' -o -name '*.webm' -o -name '*.mov' |
change the permission of all php files in current folder | find . -name "*.php" -exec chmod 755 {} \; |
delete all normal/regular files in the current folder which are empty | find . -type f -empty -delete |
Creates temporary file in a current folder and saves path to it in 'f' variable. | f=`mktemp -p .` |
Get the total sizes of all files under current directory | find . -type f -printf '%p %s\n' | awk '{ sum+=$2}; END { print sum}' |
List all files/directories under current directory using comma as the delimiter for different fields in the output | find . -ls|awk 'BEGIN{OFS=","}$1=$1' |
search for mp3 files in the folder /mp3collection which are smaller than 5MB | find /mp3collection -name '*.mp3' -size -5000k |
Execute md5sum command on files found by the find command | find -iname "MyCProgram.c" -exec md5sum {} \; |
Convert "1199092913" to dotted decimal IPv4 address | ping -c1 1199092913 | head -n1 | grep -Eow "[0-9]+[.][0-9]+[.][0-9]+[.][0-9]+" |
Get the command line args passed to a running process | ps -fp <pid> |
Go to first directory specified in PATH which contains the command 'oracle' | cd $ |
Find all files/directories with '.xml' extension that start with 'log4j' in their names under '/cygdrive/e/MyDocs/Downloads/work/OATS Domain related/' directory tree, search for files that contain the string 'CONSOLE' in their contents, then search for the string 'ASYNC' in the matched files and display the matched lines along with their filenames | find "/cygdrive/e/MyDocs/Downloads/work/OATS Domain related/" -iname "log4j*.xml" | xargs -I % grep -ilr "CONSOLE" "%" | xargs -I % grep -H "ASYNC" % |
Find all regular files named 'Chapter1' under current directory tree | find . -name Chapter1 -type f -print |
Make directories "es/LC_MESSAGES" as needed and do not error if it exists | mkdir -p es/LC_MESSAGES |
Find all files in /tmp whose names begin with the current user's name followed by "." | find /tmp -maxdepth 1 -name "$USER.*" |
Find files/directories named 'file.txt' in the path '/usr/lib/important/' | find / -path /usr/lib/important/*/file.txt |
Search the "data" directory tree for files matching pattern 'filepattern-*2009*' and save the result as 'filesOfInterest.txt' | find data/ -name filepattern-*2009* -print > filesOfInterest.txt |
Recursively copy "dir_b" to "dir_a" and delete any new files in "dir_a" | rsync -u -r --delete dir_b dir_a |
Count the number of lines in "/dir/file.txt" | cat /dir/file.txt | wc -l |
Search "input.txt" for regex patterns only matching those listed in "ignore.txt", list the unique lines and prefix with the number of occurrences | grep -of ignore.txt input.txt | sort | uniq -c |
find all the xml files in the current folder which are present in the pattern text file | find . -name "*.xml" -exec grep -HFf <(find . -name "*.txt" -printf "%f\n") {} \; |
display long listing of all files in the current directory whose size is 24 or 25 bytes . | find . -size -26c -size +23c -exec ls -l '{}' \; |
Print lines 347340107 through 347340206 in "filename" | tail -n +347340107 filename | head -n 100 |
Find all files named 'Makefile' in the /usr/ports directory tree and count the number of lines in them beginning with USE_RC_SUBR | find /usr/ports/ -name Makefile -exec grep ^USE_RC_SUBR '{}' '+' | wc -l |
Move each of the 'm?' directories in $path_to_folders to another directory whose name is constituted by appending .mbox to each directory name and create a directory named Messages in this directory then move all *.emlx files into this directory | find "$path_to_folders" -name 'm?' -type d -exec mv {} {}.mbox \; -exec mkdir {}.mbox/Messages \; -exec sh -c "mv {}.mbox/*.emlx {}.mbox/Messages" \; |
display all the files in the folder /home which do not belong to the group test | find /home ! -group test |
split a file "list.txt" into pieces per 600 lines | split -l 600 list.txt |
display all the files in the entire file system which begin with "apache-tomcat" | find / -name "apache-tomcat*" |
Find all PHP files under current directory that contain only one line | find . -type f -name '*.php' -exec wc -l {} \; | egrep "^\s*1\s" |
Find directories in the current directory (no sub-directories) and print them appended with a string literal 'Directory: ' | find . -maxdepth 1 -type d -print | xargs -I "^" echo Directory: "^" |
Subtract each column in File2 from matching column in File1, output the result in a similarly formatted table | awk 'FNR==NR { for a[$1][i]=$i; next } { for $j-=a[$1][j] }1' File2 File1 | rev | column -t | rev |
Find all files/directories under '/home/exampleuser/' directory tree whose names end with 'conf' and were modified exactly 3 days ago | find /home/exampleuser/ -name "*conf" -mtime 3 |
Remove everything in a current folder prompting user on each action. | rm -ri * |
Find .rmv files in the ./root directory recursively and copy them to directory /copy/to/here | find root -name '*.rmv' -type f -exec cp {} /copy/to/here \; |
Find all *.ogg files under the home directory ignoring the case | find $HOME -iname '*.ogg' |
Find all files/directories with '.what_to_find' extension under current directory tree and show the list by excluding paths that contain 'excludeddir1' and 'excludeddir2' | find . -name '*.what_to_find' | grep -v exludeddir1 | grep -v excludeddir2 |
Get the current shell's executable name from the output of 'ps'. | ps -p $$ | awk '$1 == PP {print $4}' PP=$$ |
Count the number of unique lines in sorted file "a.txt" compared to sorted file "b.txt" | comm -23 a.txt b.txt | wc -l |
Find all files under current directory with 755 permission and change their permission to 644 | find . -type f -perm 755 -exec chmod 644 {} \; |
Report only total size of file systems in 1T blocks. | df --total -BT | tail -n 1 | sed -E 's/total *([^ ]*).*/\1/' |
Display the number of lines in all regular files under current directory tree and also show the total count | find . -type f -exec wc -l {} + |
Find all files named "file.ext" within the current folder and print the path where each one is located | find `pwd` -name "file.ext" -exec dirname {} \; |
Print the average round trip time of 5 pings to "google.com" from OSX | ping -c 5 google.com | grep "round-trip" | cut -f 5 -d "/" |
Print the base name of the current working directory | echo "$(basename $(pwd))" |
find and image in current folder (case insensitive search) | find . -iname "Articles.jpg" |
display all the files in the current folder which are in the path ending with the folder f | find . -path '*f' |
Calculate the total size of all *.jpg files in the directory tree | find . -type f -iname "*.jpg" -ls | awk 'BEGIN {print "0"}; {print $7, "+"}; END {print "p"}' | dc |
Recursively changes group ownership of every folder in a current directory to the name of that folder. | find . -type d | sed -e 's/^\.\///g' -e 's/^\./avoid/g' | grep -v avoid | awk '{print $1"\t"$1}' | xargs chgrp |
Get the processor's addressing bus width from the output of "lshw", ie. "64 bits". | lshw -class cpu|grep "^ width"|uniq|awk '{print $2}' |
Print unique lines in "file1" compared to "file2" in the order they appear | comm -23 <(sort file1) <(sort file2)|grep -f - file1 |
Write the last line of "$file" to standard output and remove it from "$file" | tail -n 1 "$file" | tee > |
Run ./yourProgram without address space randomization, reporting actual machine type. | setarch `uname -m` -R ./yourProgram |
Find files and directories newer than CompareFile under current directory | find . -newer CompareFile -print |
Find files owned by no group | find / -nogroup |
display ten files in the tmp directory | find /tmp | head |
display all the regular/normal files in the home folder that have been modified in the last 1 day | find ~/ -daystart -type f -mtime 1 |
Find all files in the home directory with open permissions | find ~ -perm 777 |
Find all regular files that start with stat | find . -type f –iname stat* |
List each subdirectory name composing the current working directory | pwd | cut -f 1- -d\/ --output-delimiter=$'\n' |
Find all foo.mp4 files in the current directory tree and print the pathnames of their parent directories | find . -name foo.mp4 -exec dirname {} \; |
Overwirte file '/path/to/your/file' with random content, then overwrite with zeroes, and remove, showing progress while execution. | shred -v -n 1 -z -u /path/to/your/file |
Delete all files with '.old' extension under current directory tree | find . -name “*.old” -print | xargs rm |
Find all regular files named postgis-2.0.0 under current directory | find . -type f -name "postgis-2.0.0" |
find all the files in the home folder which have been modified in the last 24 hours | find $HOME -mtime -1 |
Search /var for files matching regular expression '.*/tmp/.*[0-9]*.file' | find /var -regex '.*/tmp/.*[0-9]*.file' |
Recursively changes group ownership of everything within '.git' to 'git'. | chgrp -R git .git |
Search for all files in the current directory recursively whose names begin with "Linkin Park" | find . -name "Linkin Park*" |
display the list of all the normal files excluding hidden files which have been accessed in the last 500 days | find . -type f -not -name ‘.*’ -mtime +500 -exec ls {} \; |
Change the owner of all files in "/empty_dir/" to "root" using at most 10 files at a time | ls /empty_dir/ | xargs -n10 chown root |
Find all the files/directories under user's home directory that do not belong to the user $USER | find ~ ! -user ${USER} |
find all files in current folder which have been accessed exactly 10 minutes ago | find . -amin 10 |
Search for '“foobar”' in all files starting with '‘' and ending with '’' and contain '.' in their names in the entire filesystem and display only the matched files | find / -name ‘*.*’ -exec grep -il “foobar” {} \; |
Gets domain name from dig reverse lookup and save in variable 'go'. | go=$ |
Print '-exec is an action so an implicit -print is not applied' for every file/directory found by the name 'file' under current directory tree | find -name file -exec echo '-exec is an action so an implicit -print is not applied' \; |
Remove files in the current directory tree modified more than 31 days ago recursively | find . -type f -mtime +31 -print0 | xargs -0 -r rm -f |
add read,write permissions to all the files in the current folder which have the permission 600 | find . -perm 600 -print | xargs chmod 666 |
List all cron jobs which contain "word". | crontab -l | grep 'word' |
Find how many directories are in a path | find . -type d -exec basename {} \; | wc -l |
Print only common file names in sorted listings of directory 'dir1' and 'dir2' | comm -1 -2 < < |
Display environment variable "_" of the current shell | set | grep "^_=" |
Prefix all files and directories in the current directory with "Unix_" if the files contain no whitespace or subdirectories | for FILENAME in *; do mv $FILENAME Unix_$FILENAME; done |
Find all regular files that contain 'linux' (case insensitive) in their names under '/root' directory tree | find /root -type f -iname "*linux*" |
search for the file, filename.txt in the folder /home | find /home -name filename.txt |
Split "/usr/bin/cat" into 10000 files of about equal size | split -n 10000 /usr/bin/cat |
Find all files/directories in entire file system that have "write" bit set for either the owner, the group, or others | find / -perm /a+w |
Go into the first directory whose name contains 1670 | cd `ls -d */ | grep 1670` |
Create script filesPermissions.sh that restores the original permissions of the regular files in the current directory tree | find . -type f | xargs stat -c "%a %n" | awk '{print "chmod "$1" "$2}' > ./filesPermissions.sh |
Find all *.c files under and below the current directory that contain "wait_event_interruptible" | find . -name \*.c -print0 | xargs -0 grep wait_event_interruptible /dev/null |
display all the files in the file system which are changed a minute ago | find / -newerct '1 minute ago' -print |
Process all files matching pattern 'file*' and residing in the xargstest/ directory tree with script `myscript.sh' | find xargstest/ -name 'file*' -print0 | xargs -0 myscript.sh |
Find all files that belongs to group 'root' under / directory and show a few lines of output from the beginning | find / -group root | head |
Delete characters in columns 36 through 40 from the output of "finger" | finger | sed 's/\...../\1/' |
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