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commandlinefu.com is the place to record those command-line gems that you return to again and again.

Delete that bloated snippets file you've been using and share your personal repository with the world. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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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!

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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

All commands from sorted by
Terminal - All commands - 12,380 results
clamscan -ir --bell ~user/
2009-05-21 13:09:31

Scan for viruses, recursively and print only infected files, with bell sound. Clamscan is part of clamav package. Tested on Debian.

pstree -Gap | less -r
2009-05-21 05:15:16
User: mbirk
Functions: less
Tags: less pstree

The "pstree" command uses special line-drawing characters. However, when piped into the "less" pager, these are normally disabled.

diff <(cd dir1 && find | sort) <(cd dir2 && find | sort)
2009-05-21 04:44:29
User: mbirk
Functions: cd diff find
Tags: bash diff find

This uses Bash's "process substitution" feature to compare (using diff) the output of two different process pipelines.

grep --color=always | less -R
2009-05-20 20:30:19
User: dinomite
Functions: grep less

Get your colorized grep output in less(1). This involves two things: forcing grep to output colors even though it's not going to a terminal and telling less to handle those properly.

netstat -ntlp | grep -w 80 | awk '{print $7}' | cut -d/ -f1
find / -iname '*.pdf' -print -exec pdftotext '{}' - \; | grep --color -i "unix"
find . -not \( -name .svn -prune \)
2009-05-20 19:45:24
User: mbirk
Functions: find
Tags: svn find

The "find" command can be annoying when used inside of a Subversion (or CVS) working directory. Obviously, you can combine this with other predicates and commands to create a more elaborate pipeline:

find /var/svn -type f -not \( -name .svn -prune \) -print0 | xargs -0 md5sum

Note: You can use my "dont-go-there.sh" script to wrap the "find" command and do this automatically at http://forwardlateral.com/blog/2006/02/27/dont-go-there/

grep -lir "some text" *
2009-05-20 19:44:35
User: decept
Functions: grep
Tags: find text

-l outputs only the file names

-i ignores the case

-r descends into subdirectories

find . -name "*.jar" | while read file; do echo "Processing ${file}"; jar -tvf $file | grep "Foo.class"; done
cat /etc/SuSE-release
2009-05-20 17:28:12
User: sharfah
Functions: cat
Tags: SuSE

Displays SuSE release information

function mcd() { [ -n "$1" ] && mkdir -p "$@" && cd "$1"; }
2009-05-20 16:41:48
Functions: cd mkdir

I find that I create a directory and then cd into that directory quite often. I found this little function on the internets somewhere and thought I'd share it. Just copy-paste it into you ~/.bash_profile and then `source ~/.bash_profile`.

hddtemp /dev/sda /dev/sdb /dev/hda /dev/hdb | gawk '{print $NF}' | perl -n -e '$_ =~ s/(\d+)/print "$1 "/eg }{ print "\n"'
unset TMOUT
2009-05-20 14:57:50
User: sharfah
Functions: unset

Unset TMOUT or set it to 0 in order to prevent shell autologout. TMOUT is the number of seconds after which the present shell will be killed if it has been idle for that long.

2009-05-20 14:46:18
User: syssyphus
Functions: unset

this will cause any commands that you have executed in the current shell session to not be written in your bash_history file upon logout

grep -ao -HP "http://[^/]*/" *
2009-05-20 14:45:34
User: binarycodes
Functions: grep

Replace * with any filename matching glob or an individual filename

mvn -Dmaven.test.skip=true install
2009-05-20 12:55:10
User: sharfah
Tags: maven

the maven.test.skip property can be added to other goals too.

mvn archetype:create -DgroupId=my.work -DartifactId=MyProject
2009-05-20 12:53:23
User: sharfah
Tags: maven

This will create a new directory called MyProject with a pom.xml and the following tree structure:




| |-->main

| | |-->java

| | | |-->my

| | | | |-->work

| | | | | |-->App.java

| |-->test

| | |-->java

| | | |-->my

| | | | |-->work

| | | | | |-->AppTest.java

cd "$(mktemp -d)"
2009-05-20 11:48:12
User: Weboide
Functions: cd
Tags: bash directory

This command create a new temp directory using mktemp (to avoid collisions) and change the current working directory to the created directory.

find /home/fizz -type f -printf '%TY-%Tm-%Td %TT %p\n' | sort
tr "[:upper:]" "[:lower:]" < file
fold -w 78 -s file-to-wrap
2009-05-19 19:33:10
User: GeckoDH
Functions: fold

Per default, linux/unix shells are configured with a width of 80 characters.

If you like to edit a phrase or string on a line with more than 80 characters it might take long to go there (for example a line with 1000 characters and you like to edit the 98th word which is character 598-603).

Maybe you might wish to use 78 characters, because if you forward the text via mail and the text will be quoted (2 extra characters at the beginning to the line "> "), you use 80 characters, otherwise 82, which are lame.

mencoder -aid 2 -oac copy file.avi -o english.mp3
notifyme -C `cat /etc/passwd | cut -d: -f1`
2009-05-19 19:17:05
Functions: cut

Notifyme is a program that listen in background for users login, and report on login and logout. Users can be specified from a list or in a ~/notify.rc file. -C options force to display messages on the center of the screen.See man notifyme for more details. Part of notifyme package, tested on Debian.

screen -x
2009-05-19 19:10:52
User: GeckoDH
Functions: screen

Ater person A starts his screen-session with `screen`, person B can attach to the srceen of person A with `screen -x`. Good to know, if you need or give support from/to others.

2009-05-19 19:07:11

From man tiger : Tiger is a package consisting of Bourne Shell scripts, C code and data files which is used for checking for security problems on a UNIX system. It scans system configuration files, file systems, and user configuration files for possible security problems and reports them.