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force remove all the text files that have not been modified in the last 89 days
find . -name "*.txt" -type f -daystart -mtime +89 | xargs rm -f
Forcefully remove files *~important-file
rm -rf *~important-file
forcibly and verbosely create a symbolic link named "target" to file "source"
ln -sfvn source target
forcibly and verbosely create symbolic links in directory "~/Library/LaunchAgents" to all files located in /usr/local/opt/mongodb/ and that have filename extension ".plist"
ln -sfv /usr/local/opt/mongodb/*.plist ~/Library/LaunchAgents
forcibly change owner to all files and directories in current directory to user www-data
sudo chown -Rf www-data *
forcible create a symbolic link named "/etc/file.conf" to file "/etc/configuration/file.conf"
ln -fs /etc/configuration/file.conf /etc/file.conf
forcibly create a symbolic link named "linkname" to file "new_destination"
ln -sf new_destination linkname
Forcibly create symbolic links in target directory "~/staging" for all files located in directory "~/mirror"
ln --force --target-directory=~/staging ~/mirror/*
Forcibly create symlink named as '/cygdrive/c/Users/Mic/mypics' to the directory '/cygdrive/c/Users/Mic/Desktop/PENDING - Pics/'
ln -sf '/cygdrive/c/Users/Mic/Desktop/PENDING - Pics/' '/cygdrive/c/Users/Mic/mypics'
Forcibly removes ${temp} file.
rm --force "${temp}"
Forcibly removes all files like '*.bak' and '*~'
rm -f *.bak *~
Format "$line" as a table
echo "$line" | column -t
Format "file.txt" as space separated columns 28 characters in width
cat file.txt | column -c 28 -s "\ "
Format and print the time string @133986838 according to the default time format
date --date @120024000
Format bash array "${arr}" in columns
echo " ${arr[@]/%/$'\n'}" | column
Format the date represented by time string @1267619929 according to default format and print it
date -ud @1267619929
Format file "list-of-entries.txt" as new-line separated columns
column -t -s $'\n' list-of-entries.txt
Format file "list-of-entries.txt" with no column delimiter
column -t -s '' list-of-entries.txt
Format output of 'file' content to columns with wide not less than 80 pixels
cat file | column -c 80
Format tab delimited file "list-of-entries.txt" as a table
column -t -s $'\t' list-of-entries.txt
Format tab separated fields in "FILE" as a table
column -t -s $'\t' FILE
Format the time string $timestamp according to the format string "%Y-%m-%d %H:%M:%S" and save the output to variable 'CDATE'
CDATE=$( date -d @"$timestamp" +"%Y-%m-%d %H:%M:%S" )
Format the time string @133986838 according to the default time format and save it to variable 'VARIABLENAME'
VARIABLENAME=$(date -d @133986838)
Forward all connections to client localhost 3307 via the SSH tunnel to gateway and then connect to host 1.2.3.4 to port 3306
ssh -f user@gateway -L 3307:1.2.3.4:3306 -N
Forward all connections to client localhost 3309 via the SSH tunnel to "mysql_access_server" and then connect to host "sqlmaster.example.com" on port 3306
ssh -f mysql_access_server -L 3309:sqlmaster.example.com:3306 -N
Forward port 12345 bound on 'localhost' to port 12345 on 'otherHost' as user 'otherUser'
ssh -f -N -L localhost:12345:otherHost:12345 otherUser@otherHost
Forward port 3307 on localhost to port 3306 on 1.2.3.4 via 'user@gateway' on port 24222
ssh -f user@gateway -p 24222 -L 3307:1.2.3.4:3306 -N
Forward port 8000 bound on localhost to port 22 in 'clusternode' via 'user@bridge'
ssh -L localhost:8000:clusternode:22 user@bridge
From a script, output the name of the script itself, without containing directories.
basename $0
From a script, output the name of the script itself, without containing directories - from a shell, output the name of the shell.
basename -- $0
From the list of words (one per line) in list1.txt, display the number of occurrences of this word in list2.txt and sort the results from highest to lowest count.
grep -Ff list1.txt list2.txt | sort | uniq -c | sort -n
generates a list of all files beneath the current directory whose filename DOES NOT end in .html, so it matches files like *.txt, *.jpg, and so on.
find . -type f -not -name "*.html"
Generates a randomly sorted list of numbers from 1 to 10.
seq 1 10 | sort -R | tee /tmp/lst |cat <(cat /tmp/lst) <(echo '-------') \ <(tac)
Generates default-formatted file name of temporary file in a /dev/mapper folder, and saves path to it in a variable 'MAPPER'.
MAPPER=$(mktemp -up /dev/mapper)
Generates name for temporary file with 6-letter suffix, and saves path to that new file in 'fn' variable.
fn=$(mktemp -u -t 'XXXXXX')
Generate the obsolete 29 character Spanish alphabet and number each character
echo -e {{a..c},ch,{d..l},ll,{m,n},ñ,{o..z}}"\n" | nl
Generate the Spanish alphabet and number each character
echo -e {{a..n},ñ,{o..z}}"\n" | nl
Generates temporary file in a '/dev/shm' folder and saves path to it in a 'tFile' variable.
tFile=$(mktemp --tmpdir=/dev/shm)
Generates temporary file name with full path by template 'fifo.XXXXXX' and saves it to variable 'fifo_name'
fifo_name=$(mktemp -u -t fifo.XXXXXX)
Gets a current job back to the foreground.
fg
Get a detailed list of all files on the system larger than 10MB
find / -size +10M -printf “%12s %t %h/%fn”
Getting a detailed list of files/dirs
find / -name "apt" -ls
Gets a job with defined number back to the foreground.
fg 1
Get a list of all files in the /home directory tree and their coressponding inode numbers
find /home -type f -printf "%i@%p\n"
Get a list of all hidden files from the current directory tree
find . -type f -name '.*'
Get a list of files and directories in the current directory tree
find . -print0 | xargs -0 echo
get a PID of a process
jobs -x echo %1
Get A record for domain $domain
dig $domain
Get A record for domain $domain
dig -t A $domain
Get a recursive file list of directory $dir
find "$dir" -type f
Get a recursive file list of directory $dir
find $dir -type f
Get the actual find exectuable path
which find
get all files in a current directory modified in the last 7 days
find . -mtime -7 -print0 | xargs -0 tar -cjf /foo/archive.tar.bz2
get all files in a current directory modified in the last 7 days
find . -mtime -7 -print0 | xargs -0 tar -rf /foo/archive.tar
get all the files that are exactly 30 days old
find . -mtime 30 -print
get all the files that have been modified within the last 30 days
find . -mtime -30 -print
Gets all IP addresses from host network configuration and prints first one.
ifconfig | grep "inet addr:" | grep -v "127.0.0.1" | grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1
Gets back to the foreground a job with number 2.
fg 2
Get the base filename from variable 'path', similar to using the basename command.
echo "$path" | rev | cut -d"/" -f1 | rev
get the count of all the files that have been accessed in the last 30 days
find . -atime +30 -exec ls \; | wc -l
Get current directory name without full path, ie. the part after the last /
basename "$(pwd)"
Get directory listing of URL $1 and save them to variable 'header' by deleting '\r' characters
header="$(curl -sI "$1" | tr -d '\r')"
Get the directory with least access time under current directory
find . -type d -printf "%A@ %p\n" | sort -n | tail -n 1 | cut -d " " -f 2-
Get the disk space used by all *.txt (case insensitive) files/directories under current directory
find . -name "*.txt" -print0 |xargs -0 du -ch | tail -n1
Get the disk space used by all *.txt (case insensitive) files/directories under folder 1 and folder2
find folder1 folder2 -iname '*.txt' -print0 | du --files0-from - -c -s | tail -1
Get domain name from dig reverse lookup.
$dig -x 8.8.8.8 | grep PTR | grep -o google.*
Gets domain name from dig reverse lookup.
$dig -x 8.8.8.8 | grep PTR | grep -o google.*
Gets domain name from dig reverse lookup.
dig -x 8.8.8.8 | grep PTR | cut -d ' ' -f 2 | grep google | cut -f 5
Get domain names from file '1.txt' and request TXT DNS record for each one
cat 1.txt | xargs dig TXT
Get domain name with 'google' from address $1
dig -x "$1" | grep PTR | cut -d ' ' -f 2 | grep google | cut -f 5
Get domain name with 'google' from address $IP
dig -x $IP | grep PTR | cut -d ' ' -f 2 | grep google | cut -f 5
Get files that last had their meta information changed more than 3 days ago
find / -ctime +3
get the git user access
su git
Get the grandparent directory of each found 'pattern' file in $SEARCH_PATH
find "$SEARCH_PATH" -name 'pattern' | rev | cut -d'/' -f3- | rev
Gets the groups these users belong to.
groups a b c d
Gets IP address of ${NET_IF} network interface.
NET_IP=`ifconfig ${NET_IF} | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1'`
Gets IP address of 'eth0' network interface.
ifconfig eth0 | grep -oP '(?<= inet addr:)[^ ]+'
Gets IP address of 'eth0' network interface.
ifconfig eth0 | grep inet | cut -d: -f2 | cut -d' ' -f1
Gets IP addresses of all active network interfaces.
ifconfig | grep -oP "(?<=inet addr:).*?(?= Bcast)"
Gets IP addresses of all active network interfaces.
ifconfig | grep -oP "(?<=inet addr:).*?(?=Bcast)"
Gets IP addresses of all active network interfaces and saves to 'ip' variable.
ip=$(ifconfig | grep -oP "(?<=inet addr:).*?(?=Bcast)")
Gets IP address of first listed network interface in system.
ifconfig | grep 'inet addr:' | grep -v 127.0.0.1 | head -n1 | cut -f2 -d: | cut -f1 -d ' '
Gets list of IP addresses of all network interfaces.
ifconfig | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1'
Gets MAC address of 'eth0' network interface.
ifconfig eth0 | grep -Eo ..\(\:..\){5}
Gets MAC address of 'eth0' network interface.
ifconfig eth0 | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}'
Gets MAC address of 'eth0' network interface.
ifconfig eth0 | head -n1 | tr -s ' ' | cut -d' ' -f5
Gets MAC address of en0 network interface.
ifconfig en0 | grep -Eo ..\(\:..\){5}
Gets MAC address of en0 network interface.
ifconfig en0 | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}'
Gets MAC address of eth0 network interface.
ifconfig eth0 | grep -Eoi [:0-9A-F:]{2}\(\:[:0-9A-F:]{2}\){5}
Gets MAC address of eth0 network interface.
ifconfig eth0 | grep HWaddr | cut -d ' ' -f 9
Gets MAC address of eth0 network interface.
ifconfig | grep -i hwaddr | cut -d ' ' -f9
Get the number of "use" statements in all PHP files, ordered
find . -type f -name "*.php" -exec grep --with-filename -c "^use " {} \; | sort -t ":" -k 2 -n -r
Get the number of regular files in the directory given as the bash script argument $1
find $1 -type f | wc -l
Get only the latest version of the file 'filename' under current directory
find . -name 'filename' | xargs -r ls -tc | head -n1
Get the path of running Apache
ps -ef | grep apache
get the root access
sudo su
get the root access
sudo su -
get the root user access
sudo su
get second-to-last comma-separated field of each line in file.txt
cat file.txt | rev | cut -d ',' -f 2 | rev
Get the sizes (and total size) of all files under dir2 directory
find dir2 ! -type d |xargs wc -c