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Save number of strings with $expression pattern in 'foo.txt' to 'big_lines' variable. | big_lines=`cat foo.txt | grep -c "$expression"` |
Save list of groups which user $line belongs to and not matching pattern "_unknown|sciences|everyone|netaccounts" in 'results' variable | results=$ |
Find all empty directories under a certain path | find /tmp -type d -empty |
Search PATH for utilities called "rename", display the type of file for each match found. | which -a rename | xargs readlink -f | xargs file |
Find all files/directories under current directory tree whose names start with 'some_text_2014.08.19' | find . -name 'some_text_2014.08.19*' |
Recursively finds strings with 'word-1' or 'word-2' in any file under 'directory-path', following symlinks, and prints found strings. | egrep -R "word-1|word-2” directory-path |
delete all the trace files from the folder $DBA/$ORACLE_SID/bdump/ which have not been accessed in the last 7*24 hours | find $DBA/$ORACLE_SID/bdump/*.trc -mtime +7 -exec rm {} \; |
Print environment variable "IFS" and its value | set | grep ^IFS= |
Set permissions for all direcotries under /var/www to 755 | find /var/www -type d -print0 | xargs -0 chmod 755 |
Find executable files | find . -perm -100 -print |
find all files in the file system whose size is exactly 2KB | find / -size 2048c |
Print the list of all regular files on the system using "echo" | find / -type f -exec echo {} \; |
display all the users in the current folder that belong to the group "sunk" | find . -type f -group sunk |
Display a binary file as a sequence of hex codes | od -t x1 file|cut -c8- |
Disables shell option 'nocasematch'. | shopt -u nocasematch |
Find all *.c files under and below the current directory that contain "hogehoge" | find . -name \*.c | xargs grep hogehoge |
Find files/directories named 'sar' under directory trees whose path starts with '/u' or '/b' or '/s' or '/o' | find `ls -d /[ubso]*` -name sar |
find Texinfo source files in /usr/local/doc | find foo -path foo/bar -print |
Create a variable CDATE in the current shell that contains the date in '%Y-%m-%d %H:%M:%S' format , and a variable EPOCH that contains the seconds since epoch | source < |
Find all files/directories named 'top' in the entire filesystem | find / -name top |
Create symbolic links in the current directory for all files excluding "CONFIGFILE" located under "/your/project" directory tree | find /your/project -type f ! -name 'CONFIGFILE' -exec ln -s \{\} ./ \; |
Search the entire file hierarchy for files ending in '.old' and delete them. | find / -name "*.old" -exec /bin/rm {} \ |
Count the number of files in the /usr/ports directory tree whose names begin with 'pkg-plist' and which contain 'dirrmtry' | find /usr/ports/ -name pkg-plist\* -exec grep dirrmtry '{}' '+' | wc -l |
Interactively page through the color-coded output of 'ls'. | ls --color | less -r |
Print the full path prefix for all files in the current directory tree as a list | tree -fi |
find all regular files which have been modified in the last 48 hours in home folder | find ~ -type f -mtime -2 |
move all the html files from current folder to another folder and if a symbolic link is found copy the original referenced file and not the link | find . -follow -iname '*.htm' -print0 | xargs -i -0 mv '{}' ~/webhome |
Archive "/path/to/files" to "user@targethost:/path" | rsync -av /path/to/files user@targethost:/path |
Find all *.jpg files on the system | find / -name *.jpg 2>/dev/null |
display all the files in the entire file system | find / -name "*" — print |
Print the list of files in the current directory tree skipping SVN files | find . -name .svn -a -type d -prune -o -print |
Find all files/directories in entire file system that are owned by "shadow" group | find / -group shadow |
find all the files in the current directory and search for the word "pw0" in them. | find . -exec grep -i "pw0" {} \; |
Delete files in /var/tmp/stuff and below that have not been modified in over 90 days | find /var/tmp/stuff -mtime +90 -delete |
Remove everything in the current directory except files matching regular expression "exclude these" | find . -maxdepth 1 | grep -v "exclude these" | xargs rm -r |
Print the user name of the user running sudo | who -m | awk '{print $1}' |
Set permissions to 600 for regular files under var/ | find var/ -type f -exec chmod 600 {} \; |
Search the directory tree /tmp for regular files using zero delimiter for output | find /tmp -type f -print0 |
Prints process tree of a process having id $mypid, with command options and process id number. | pstree -aAp $ |
Find all *.m4a files under /home/family/Music directory and convert them to ogg | find /home/family/Music -name '*.m4a' -exec ffmpeg -i "{}" -acodec libvorbis -aq 6 -vn -ac 2 "{}.ogg" \; |
Find every file/directory under the directory /home owned by the user joe | find /home -user joe |
Recursively changes group ownership of everything within '/git/our_repos' to 'shared_group'. | chgrp -R shared_group /git/our_repos |
Find all files/directories under $1 which have at least execute permission for their owner and set execute permission for group for these files/directories | find $1 -perm -u+x -exec chmod g+x {} \; |
Remove everything within parentheses and substitute all non digit characters with a space from "1/2 [3] (27/03/2012 19:32:54) word word word word 4/5" and format the output as a table | echo '1/2 [3] (27/03/2012 19:32:54) word word word word 4/5' | sed -e 's/(.*)//' -e 's/[^0-9]/ /g' | column -t |
Returns exit code 1. | a=$(false) |
Delete all files/directories named 'sample' (case insensitive) under '/home/user/Series/' directory tree as super user | sudo find /home/user/Series/ -iname sample -print0 | sudo xargs -0 rm -r |
set alias "logspace" for command "find /apps/ /opt/ -type f -size +100M -exec ls -lh {} \; | awk '{print $5, $9 }'" | alias logspace="find /apps/ /opt/ -type f -size +100M -exec ls -lh {} \; | awk '{print $5, $9 }'" |
Search every directory except the subdirectory excluded_path for a regular file 'myfile' | find / -path excluded_path -prune -o -type f -name myfile -print |
change owner and group of all files and directory into current directory to user and group apache | find . -maxdepth 1 -not -name "." -print0 | xargs --null chown -R apache:apache |
display all the files only in the path "./sr*sc" | find . -path "./sr*sc" |
Recursively change owner and group to "$JBOSS_AS_USER" of "$JBOSS_AS_DIR/" | chown -R $JBOSS_AS_USER:$JBOSS_AS_USER $JBOSS_AS_DIR/ |
create directory backup | mkdir backup |
change group of the file /var/lib/php/session to group lighttpd | chown -R :lighttpd /var/lib/php/session |
Print "echo ping -c 2" on each string in file 'ips' | cat ips | xargs -n1 echo ping -c 2 |
Clear the terminal's search history | history -c |
find all files beneath the current directory that begin with the letters 'Foo' and delete them. | find . -type f -name "Foo*" -exec rm {} \; |
Get a list of all hidden files from the current directory tree | find . -type f -name '.*' |
Recursively change the owner of all files in "~/tmp" to "$USER" | sudo chown -R $USER ~/tmp |
Count the number of lines in every regular .rb file in the current directory tree | find . -name "*.rb" -type f -exec wc -l \{\} \; |
Find all 777 permission directories and use chmod command to set permissions to 755 | find / -type d -perm 777 -print -exec chmod 755 {} \; |
Print the time of last boot | who -b |
search for all perl files in the folder /nas/projects/mgmt/scripts/perl which have been modified yesterday | find /nas/projects/mgmt/scripts/perl -mtime 1 -daystart -iname "*.pl" |
Just find directories and skip file names | find / -type d -name "apt" -ls |
Print current shell using process ID | ps -ef | grep $$ | grep -v grep |
Strips last section from the path $pathname, and prints basename of the rest part. | echo $(basename $(dirname $pathname)) |
Copy '/path/to/source' from remote "username@computer" to local "/path/to/dest" | rsync -r username@computer:/path/to/source /path/to/dest |
find all the regular/normal files in the current folder which belong to the group "flossblog" | find . -group flossblog -type f |
Find all *.tex regular files under current directory | find . -type f -name "*.tex" |
Save 'echo whatever you "want your" command to be' in history | history -s 'echo whatever you "want your" command to be' |
Output the string 'yes' continously until killed | yes |
find all files under the /etc directory and display IP address patterns in them | find /etc -type f -exec cat '{}' \; | tr -c '.[:digit:]' '\n' \ | grep '^[^.][^.]*\.[^.][^.]*\.[^.][^.]*\.[^.][^.]*$' |
list the first line in every text file under the users home directory into report.txt | find $HOME/. -name *.txt -exec head -n 1 -v {} \; > report.txt |
Count the number of differing lines in "file1" and "file2" with 0 lines of unified context | diff -U 0 file1 file2 | grep -v ^@ | wc -l |
Find user daniel's files of type jpeg without `autumn' in the name | find . -user daniel -type f -name *.jpg ! -name autumn* |
display all the configuration files in "/etc" folder along with their last access and modified timestamps | find /etc -name "*.conf" -printf "%f accessed %AF %Ar, modified %TF %Tr\n" |
create a compressed archive "filename.tar.gz" with verbose output | tar -cvzf filename.tar.gz folder |
Find files named "needle" ignoring the case | find . -iname "needle" |
Create a copy of the current working directory structure in the usr/project directory, | find . -type d -print|sed 's@^@/usr/project/@'|xargs mkdir -p |
Print pathnames of all files in the current directory and below skipping files under SCCS directories | find . -print -name SCCS -prune |
Print the current user's mail file in "/var/spool/mail" | cat /var/spool/mail/`whoami` |
Find all files under /path and calculate their md5sum | find /path -type f -print0 | xargs -0 md5sum |
Search for directories that contain the phrase "foo" but do not end in ".bar" | find . -name '*foo*' ! -name '*.bar' -type d -print |
Find all files, folders, symlinks, etc in the current directory recursively | find . |
Search /usr/bin for regular files that have been modified within the last 10 days | find /usr/bin -type f -mtime -10 |
Read a line from standard input into variable "response" ignoring backslash escapes and using the prompt "${1:-Are you sure? [y/N]} " | read -r -p "${1:-Are you sure? [y/N]} " response |
Display a long listing of the oldest file under '/hom/backups' directory tree | find /home/backups -printf "%T@ %p\n" | sort -n | head -1 | cut -d" " -f2- | xargs ls -al |
Generate UUIDs for the files from the current directory tree | find . -printf "%P\0" | sort -z | while IFS= read -d '' -r f; do echo "$ $f"; done |
Print the IP addresses for the current host name | hostname -I | cut -f1 -d' ' |
display all files in current folder ending with "~" or "#" using regular expression | find -regex "^.*~$\|^.*#$" |
Set the shell prompt to "host:pwd>" | PS1=`hostname`':\W> ' |
find all directories named build under the current directory | find . -type d -name build |
delete all the trace files (".trc") from the folder $DBA/$ORACLE_SID/bdump/ which have not been accessed in the last 7*24 hours | find $DBA/$ORACLE_SID/bdump/*.trc -mtime +7 -exec rm {} \; |
Search for files whose size is between 100 kilobytes and 500 kilobytes | find . -size +100k -a -size -500k |
Recursively find the latest modified file in the current directory | find . -type f -print0|xargs -0 ls -drt|tail -n 1 |
delete all files in the home directory which ahve the name core in them | find ~/ -name 'core*' -exec rm {} \; |
Find all files/directories under /usr/tom which matches the extended regex '*.pl| *.pm' in their names | find /usr/tom | egrep '*.pl| *.pm' |
Print the first 5 decompressed lines of compressed file "$line" | zcat "$line" | head -n5 |
display all files in current directory discard any errors and save the output to a file | find . 2>&1 | grep -v 'permission denied' > files_and_folders |
Find all *fink* files/directories in entire file system | find / -name "*fink*" -print |
Replace all URLs in "MyHTMLFile.html" with "$pub_url" and create a backup with suffix ".bak" | sed -i.bak "s#https.*\.com#$pub_url#g" MyHTMLFile.html |
Subsets and Splits