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May 19, 2015 - A Look At The New Commandlinefu
I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management
I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!

Top Tags



Psst. Open beta.

Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:

  • » The open beta is running a copy of the database that will not carry over to the final version. Don't post anything you don't mind losing.
  • » If you wish to use your user account, you will probably need to reset your password.
Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

Commands tagged bash from sorted by
Terminal - Commands tagged bash - 732 results
function nowrap { export COLS=`tput cols` ; cut -c-$COLS ; unset COLS ; }
function sepath { echo $PATH |tr ":" "\n" |sort -u |while read L ; do cd "$L" 2>/dev/null && find . \( ! -name . -prune \) \( -type f -o -type l \) 2>/dev/null |sed "s@^\./@@" |egrep -i "${*}" |sed "s@^@$L/@" ; done ; }
2009-09-11 15:03:22
User: mobidyc
Functions: cd echo egrep find read sed sort tr
Tags: bash ksh PATH

search argument in PATH

accept grep expressions

without args, list all binaries found in PATH

PS3="Enter a number: "; select f in *;do $EDITOR $f; break; done
2009-09-10 06:04:42
User: haivu
Tags: bash

This command displays a simple menu of file names in the current directory. After the user made a choice, the command invokes the default editor to edit that file.

* Without the break statement, the select command will loop forever

* Setting the PS3 prompt is optional

* If the user types an invalid choice (such as the letter q), then the variable $f will become an empty string.

* For more information, look up the bash's select command

echo $PATH | tr \: \\n
2009-09-09 02:10:04
User: crk
Functions: echo tr
Tags: bash echo tr PATH

This version uses Pipes, but is easier for the common user to grasp... instead of using sed or some other more complicated method, it uses the tr command

some_very_long_and_complex_command # label
2009-09-08 05:58:27
User: jamolkhon

When using reverse-i-search you have to type some part of the command that you want to retrieve. However, if the command is very complex it might be difficult to recall the parts that will uniquely identify this command. Using the above trick it's possible to label your commands and access them easily by pressing ^R and typing the label (should be short and descriptive).


One might suggest using aliases. But in that case it would be difficult to change some parts of the command (such as options, file/directory names, etc).

find . -regex '.*\(h\|cpp\)'
2009-09-06 11:33:19
User: Vereb
Functions: find
Tags: bash find

This is the way how you can find header and cpp files in the same time.

watch -n <seconds> <command>
du -a --max-depth=1 | sort -n | cut -d/ -f2 | sed '$d' | while read i; do if [ -f $i ]; then du -h "$i"; else echo "$(du -h --max-depth=0 "$i")/"; fi; done
2009-09-03 20:43:43
User: nickwe
Functions: cut du echo read sed sort

Based on the MrMerry one, just add some visuals to differentiate files and directories

find . -maxdepth 1 -type d|xargs du -a --max-depth=0|sort -rn|cut -d/ -f2|sed '1d'|while read i;do echo "$(du -h --max-depth=0 "$i")/";done;find . -maxdepth 1 -type f|xargs du -a|sort -rn|cut -d/ -f2|sed '$d'|while read i;do du -h "$i";done
2009-09-03 20:33:21
User: nickwe
Functions: cut du echo find read sed sort xargs

Based on the MrMerry one, just add some visuals and sort directory and files

function checkfor () { while :; do $*; sleep 5; done; }
2009-09-03 19:35:42
User: relay
Functions: sleep
Tags: bash

checkfor: have the shell check anything you're waiting for.

'while : ; do' is an infinite loop

'$*' executes the command passed in

'sleep 5' - change for your tastes, sleep for 5 seconds

bash, ksh, likely sh, maybe zsh

Ctrl-c to break the loop

function fcd () { [ -f $1 ] && { cd $(dirname $1); } || { cd $1 ; } pwd }
2009-09-03 18:58:13
User: relay
Functions: cd dirname pwd
Tags: bash ksh

fcd : file change directory

A bash function that takes a fully qualified file path and cd's into the directory where it lives. Useful on the commadline when you have a file name in a variable and you'd like to cd to the directory to RCS check it in or look at other files associated with it.

Will run on any ksh, bash, likely sh, maybe zsh.

echo "${PATH//:/$'\n'}"
for i in 192.168.1.{61..71};do ping -c 1 $i &> /dev/null && echo $i;fi;done
2009-08-26 06:04:24
User: AlecSchueler
Functions: echo ping
Tags: Network ssh bash

If you need to ssh into a computer on the local network but you're unsure of the ip to use, then ping them and see if you get a response. If you do, print out the address you got it from. Adjust the range to suit your network.

for file in <filename>; do cp $file{,.bak} && sed 's/old/new/g' $file.bak > $file; done
2009-08-25 16:19:45
User: Cenobite
Functions: cp file sed
Tags: bash sed

"&&" runs sed if and only if the backup completed and /bin/cp exited cleanly. Works for multiple files; just specify multiple filenames (or glob). Use -v switch for cp to play it safe.

eval $(sed -n "s/^d[^D]*DB_\([NUPH]\)[ASO].*',[^']*'\([^']*\)'.*/_\1='\2'/p" wp-config.php) && mysqldump --opt --add-drop-table -u$_U -p$_P -h$_H $_N | gpg -er AskApache >`date +%m%d%y-%H%M.$_N.sqls`
2009-08-18 07:03:08
User: AskApache
Functions: eval gpg sed

The coolest way I've found to backup a wordpress mysql database using encryption, and using local variables created directly from the wp-config.php file so that you don't have to type them- which would allow someone sniffing your terminal or viewing your shell history to see your info.

I use a variation of this for my servers that have hundreds of wordpress installs and databases by using a find command for the wp-config.php file and passing that through xargs to my function.

IFS=:; find $PATH | grep pattern
2009-08-14 13:38:58
User: camspiers
Functions: find grep
Tags: bash find grep

Best to put it in a file somewhere in your path. (I call the file spath)


IFS=:; find $PATH | grep $1

Usage: $ spath php

id="dMH0bHeiRNg";mplayer -fs http://youtube.com/get_video.php?video_id=$id\&t=$(curl -s http://www.youtube.com/watch?v=$id | sed -n 's/.*, "t": "\([^"]*\)", .*/\1/p')
2009-08-13 14:16:01
User: matthewbauer
Functions: id sed

The original doesn't work for me - but this does. I'm guessing that Youtube updated the video page so the original doesn't work.

not necessarily better, but many...!
2009-08-12 11:03:26
Tags: bash awk

( IFS=:; for i in $PATH; do echo $i; done; )

echo $PATH|sed -e 's/:/\n/g' # but the tr one is even better of course

echo $PATH|xargs -d: -i echo {} # but this comes up with an extra blank line; can't figure out why and don't have the time :(

echo $PATH|cut -d: --output-delimiter='

' -f1-99 # note -- you have to hit ENTER after the first QUOTE, then type the second one. Sneaky, huh?

echo $PATH | perl -l -0x3a -pe 1 # same darn extra new line; again no time to investigate

echo $PATH|perl -pe 's/:/\n/g' # too obvious; clearly I'm running out of ideas :-)

echo $PATH|awk -F: ' { for (i=1; i <= NF; i++) print $i }'
img test.jpg
2009-08-11 22:09:21
User: Inouire
Tags: bash java picture

This command allows you to see a preview of a picture via the terminal. It can be usefull when you are ssh'ing your server without X-forwarding.

To have en example of the output you can get with this command see http://www.vimeo.com/3721117

Download at http://inouire.net/image-couleur.html

Sources here: http://inouire.net/archives/image-couleur_source.tar.gz

find $MAILDIR/ -type f -printf '%T@ %p\n' | sort --reverse | sed -e '{ 1,100d; s/[0-9]*\.[0-9]* \(.*\)/\1/g }' | xargs -i sh -c "cat {}&&rm -f {}" | gzip -c >>ARCHIVE.gz
old='apt-get'; new="su-${old}"; command="sudo ${old}"; alias "${new}=${command}"; $( complete | sed -n "s/${old}$/${new}/p" ); alias ${new}; complete -p ${new}
2009-08-10 00:15:05
User: Josay
Functions: alias sed

In Bash, when defining an alias, one usually loses the completion related to the function used in that alias (that completion is usually defined in /etc/bash_completion using the complete builtin).

It's easy to reuse the work done for that completion in order to have smart completion for our alias.

That's what is done by this command line (that's only an example but it may be very easy to reuse).

Note 1 : You can use given command line in a loop "for old in apt-get apt-cache" if you want to define aliases like that for many commands.

Note 2 : You can put the output of the command directly in your .bashrc file (after the ". /etc/bash_completion") to always have the alias and its completion

cd `dirname $_`
cd !$:h
2009-08-07 00:37:08
User: lingo
Functions: cd

Uses the last argument of the last executed command, and gets the directory name from it.

Use $!:t for the filename alone, without the dirname.

wget `lynx -dump http://www.ebow.com/ebowtube.php | grep .flv$ | sed 's/[[:blank:]]\+[[:digit:]]\+\. //g'`
2009-08-02 14:09:53
User: spaceyjase
Functions: grep sed wget

I wanted all the 'hidden' .flv files from the http link in the command line; wget seemed appropriate, fed with output from lynx, grep the flv files and the normalised via sed (to remove the numeric bullet). Similar to the 'Grab mp3 files' fu. Replace link with your own, grep arg with something more interesting ;) See here for something along the same lines...


Hope you find it useful! Improvements welcome, naturally.