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2011-03-12 - Confoo 2011 presentation
Slides are available from the commandlinefu presentation at Confoo 2011: http://presentations.codeinthehole.com/confoo2011/
2011-01-04 - Moderation now required for new commands
To try and put and end to the spamming, new commands require moderation before they will appear on the site.
2010-12-27 - Apologies for not banning the trolls sooner
Have been away from the interwebs over Christmas. Will be more vigilant henceforth.
2010-09-24 - OAuth and pagination problems fixed
Apologies for the delay in getting Twitter's OAuth supported. Annoying pagination gremlin also fixed.




All commands from sorted by
Terminal - All commands - 11,859 results
col1(){ case $# in 0)echo col1 col-length;;*) sed 's/\(.\{'"$1"'\}\)\(.*\)/\1/' esac;}
2011-12-30 23:35:29
User: argv
Functions: sed

for small output only

example usage:

jobs -l |col1 72

sudo pmset -a hibernatemode 1
ps ux|grep <process name>|awk '{print $2}'|xargs -n 1 kill
removedir () { echo "Deleting the current directory $PWD Are you sure?"; read human; if [[ "$human" = "yes" ]]; then blah=$(echo "$PWD" | sed 's/ /\\ /g'); foo=$(basename "$blah"); rm -Rf ../$foo/ && cd ..; else echo "I'm watching you" | pv -qL 10; fi; }
2010-01-17 11:34:38
User: oshazard
Functions: basename cd echo read rm sed


Version 1.1

removedir () { echo "You are about to delete the current directory $PWD Are you sure?"; read human; if [[ "$human" = "yes" ]]; then blah=$(echo "$PWD" | sed 's/ /\\ /g'); foo=$(basename "$blah"); rm -Rf ../$foo/ && cd ..; else echo "I'm watching you" | pv -qL 10; fi; }


Folders with spaces

Version 1.0

removedir () { echo "You are about to delete the current directory $PWD Are you sure?"; read human; if [[ "$human" = "yes" ]]; then blah=`basename $PWD`; rm -Rf ../$blah/ && cd ..; else echo "I'm watching you" | pv -qL 10; fi; }


Hidden directories (.dotdirectory)

Version 0.9

rmdir () { echo "You are about to delete the current directory $PWD. Are you sure?"; read human; if [[ "$human" = "yes" ]]; then blah=`basename $PWD`; rm -Rf ../$blah/ && cd ..; else echo "I'm watching you" | pv -qL 10; fi; }

Removes current directory with recursive and force flags plus basic human check. When prompted type yes

1. [user@host ~]$ ls

foo bar

2. [user@host ~]$ cd foo

3. [user@host foo]$ removedir

4. yes

5. rm -Rf foo/

6. [user@host ~]$

7. [user@host ~]$ ls


cat .ssh/id_rsa.pub | ssh user@server "cat >>.ssh/authorized_keys2"
trap '' 1 2 20 24(signal number)
tail -n 20 ~/Library/Logs/FileSyncAgent.log
2009-02-19 05:05:21
User: sacrilicious
Functions: tail

tail would be considered dull, but pair this with being able to push out unix commands over ARD, and life gets easier. (Same can be said for my TimeMachine scrape command, http://xrl.us/begrzb)

find directory -maxdepth 1 -iname "*" | awk 'NR >= 2'
2014-04-01 00:09:12
User: chilicuil
Functions: awk find

find . -maxdepth 1 -iname ".*" | awk 'NR >= 2'

Can be used to list only dotfiles without . nor ..

(cd /bin; set -- *; x=$((1+($RANDOM % $#))); man ${!x})
2012-02-10 06:24:20
User: f4m8

Very similar but no use of `tr` for

function liner() {

local num_lines=${1:-42}

local line=$(printf %${num_lines}s)

echo ${line// /#}


v () { echo "$@"; "$@"; }
2011-10-13 11:33:19
User: hfs
Functions: echo

You can use this in shell scripts to show which commands are actually run. Just prepend every "critical line" with "v˽".


echo "Let me create a directory for you"

v mkdir $TMP/new

In scripts this can be more useful than "set -x", because that can be very verbose with variable assignments etc.

Another nice use is if you prepend every "critical" command with "v", then you can test your script by commenting out the actual execution.

renice -20 -g 2874 (2784 found with ps -Aj)
iptables -L -n -v
mkpasswd() { head -c $(($1)) /dev/urandom | uuencode - | sed -n 's/.//;2s/\(.\{'$1'\}\).*/\1/p' ;}
2009-11-19 14:27:52
User: taliver
Functions: head sed uuencode

This uses urandom to produce a random password. The random values are uuencoded to ensure only printable characters. This only works for a number of characters between 1 and 60.

for /f "delims==" %a in (' dir "%USERPROFILE%\*.sqlite" /s/b ') do echo vacuum;|"sqlite3.exe" "%a"
2010-01-18 20:56:00
User: vutcovici
Functions: dir echo

This command defragment the SQLite databases found in the home folder of the current Windows user.

This is usefull to speed up Firefox startup.

The executable sqlite3.exe must be located in PATH or in the current folder.

In a script use:

for /f "delims==" %%a in (' dir "%USERPROFILE%\*.sqlite" /s/b ') do echo vacuum;|"sqlite3.exe" "%%a"
alias cstdin='echo "Ctrl-D when done." && gcc -Wall -o ~/.stdin.exe ~/.stdin.c && ~/.stdin.exe'
2009-11-19 16:38:51
User: taliver
Functions: alias gcc

This is a quick hack to make a gcc caller. Since it runs with gcc instead of tcc, it's a bit more trustworthy as far as the final answers of things go.

man $(ls -1 /usr/share/man/man?/ | shuf -n1 | cut -d. -f1)
2010-08-20 23:36:10
User: dooblem
Functions: cut ls man
Tags: man sort shuf

Another one.

Maybe not the quicker because of the sort command, but it will also look in other man sections.

updated with goodevilgenius 'shuf' idea

mkdir `date | sed 's/[: ]/_/g'`
2009-04-29 21:28:45
User: copremesis
Functions: mkdir sed

use today's time stamp to make a unique directory for today or an hour ago ...

echo -e "HEAD / HTTP/1.1\nHost: slashdot.org\n\n" | nc slashdot.org 80 | head -n5 | tail -1 | cut -f2 -d-
gst123 -z **/*
2010-05-18 13:45:41
User: eolo999
Tags: music zsh gst123

Depends on zsh and gst123 ( http://space.twc.de/~stefan/gst123.php )

cd in_your_music_root_folder and then issue the command

for i in $(tar -tf <file.tar.gz>); do rm $i; done;
2009-07-06 19:57:23
User: din7
Functions: rm tar

Remove annoying improperly packaged files that untar into the incorrect directory.

Example, When you untar and it extracts hundreds of files into the current directory.... bleh.

apropos keyword
cat file1 ... fileN > combinedFile;
2010-04-17 01:00:04
User: GinoMan2440
Functions: cat
Tags: cat bash Linux

the last person who posted used the most roundabout way to concatinate files, there's a reason there's a "conCATinate" command... Using this method, you also get to choose the order of the files, below another person just did *.txt > combined.txt which is fine but the order depends on the implementation of "cat" which is probably alphabetical order of filenames.

top -b -n 1 |grep httpd|wc -l
2010-07-25 08:40:03
User: dotanmazor
Functions: grep top wc

Of course, the httpd can be replaced with any other process name

while sleep 1; do date; (netstat -a -n | grep 80) ; done