Hide

What's this?

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.


Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

Universal configuration monitoring and system of record for IT.
Hide

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

Hide

News

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!
Hide

Top Tags

Hide

Functions

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 - 12,353 results
mate - `find . -name 'filename'`
cat welcome | wall
2009-02-14 18:12:50
User: Williebee
Functions: cat
-3

Show message in file "welcome" to all logged in terminal users.

vrms
2009-04-22 06:54:20
User: eastwind
-3

tell you how many Non free software is on your machine, which package it is and which restriction on freedom it has . require vrms package , vrms mean virtual Richard M. Stallman :)

ls | perl -lne '++$x{lc $1} if /[.](.+)$/ }{ print for keys %x'
2010-08-13 20:05:15
User: recursiverse
Functions: ls perl
-3

All with only one pipe. Should be much faster as well (sort is slow). Use find instead of ls for recursion or reliability.

Edit: case insensitive

awk '{if (NR % 2 == 0) print $0}' file.txt
echo '!'whammy
2009-03-26 23:34:33
User: sudopeople
Functions: echo
Tags: literal bang
-3

Seems obvious, but other seemingly simple ways to use it don't work:

echo !whammy

and

echo "!whammy"

both output:

-bash: !whammy: event not found

and this:

echo "\!whammy"

outputs:

\!whammy

with the slash :(

you can also do any combinations of quotes for a complex string:

echo "It's great to be able to use a bang ("'!'") in a command"'!'

outputs:

It's great to be able to use a bang (!) in a command!
s=`head -$i fileName | tail -1`
mkdir ${1..10}
ls -ad .*
2009-02-18 15:22:39
User: osantana
Functions: ls
-3

List only hidden files (or directories). You also can use:

ls -lad .*
rename .txt .md *.txt
ls | while read -r FILE; do mv -v "$FILE" `echo $FILE | tr -d ' '`; done
2010-08-14 14:10:48
User: IgnitionWeb
Functions: ls mv read tr
Tags: space echo while tr
-3

all files in the directory get moved, in doing so the new name of the file is the original name with out spaces (using translate command)

while true ; do scripts/bootstrap.py ; ./manage.py runserver ; done
2009-03-27 04:43:54
User: taurus
Functions: true
-3

I wrote a script called bootstrap.py to delete the database, then load a new database with initial values. With this single-line shell loop, when I need to make a schema change (which happens often in the early stages of some projects), I hit ctrl-C to stop the running Django server, then watch bootstrap.py do its thing, then watch the server restart.

0,30 * * * * php -q /address/to/script.php
2010-01-11 10:44:13
User: dotanmazor
-3

Just put this line in a file that resides in your /etc/cron.d/ folder, and you're set.

The -q option is used to suppress php headers.

ls -lS
count=`wc -l file | cut -d ' ' -f1`
rec -c 2 -r 44100 -s -t wav - | flac - --sign=signed --channels=2 --endian=big --sample-rate=44100 --bps=16 -f -o file.flac
2011-08-30 03:14:32
User: bohwaz
-3

You'll need to install sox and flac packages in Debian/Ubuntu.

dups() { sort "$@" | uniq -d; }
rm -rf `ls | head -5000`
2009-02-25 22:52:23
User: rockon
Functions: head rm
-3

Deletes thousands of files at one go, I'm not able to recall the exact # of files that rm can delete at one go(apprx. around 7000.)

a=($(ls *html)) && a=${a[$(expr ${#a[@]} - 1)]} && rm $a
2009-10-12 16:40:06
Functions: expr ls rm
-3

plays with bash arrays. instead of storing the list of files in a temp file, this stores the list in ram, retrieves the last element in the array (the last html file), then removes it.

sed -e '/^[[:blank:]]*#/d; s/[[:blank:]][[:blank:]]*#.*//' -e '/^$/d' -e '/^\/\/.*/d' -e '/^\/\*/d;/^ \* /d;/^ \*\//d' /a/file/with/comments
2009-11-10 17:47:22
Functions: sed
Tags: sed PHP
-3

Strips comments from at least bash and php scripts. Normal # and // as well as php block comments

removes all of the:

empty/blank lines

lines beginning with #

lines beginning with //

lines beginning with /*

lines beginning with a space and then *

lines beginning with */

It also deletes the lines if there's whitespace before any of the above.

Add an alias to use in .bashrc like this:

alias stripcomments="sed -e '/^[[:blank:]]*#/d; s/[[:blank:]][[:blank:]]*#.*//' -e '/^$/d' -e '/^\/\/.*/d' -e '/^\/\*/d;/^ \* /d;/^ \*\//d'"
cat /etc/SuSE-release
2009-05-20 17:28:12
User: sharfah
Functions: cat
Tags: SuSE
-3

Displays SuSE release information

vi2() {for i in $@; do [ -f "$i" ] && [ ! -w "$i" ] && sudo vim $@ && return; done; vim $@}
2010-08-15 10:00:14
User: pipeliner
Functions: sudo vim
Tags: vim sudo
-3

Like the http://www.commandlinefu.com/commands/view/6327/open-file-with-sudo-when-there-is-no-write-permission, but works (in zsh; my commandlinefu is not strong enough to understand why bash don't like it) with vim options, like -O, and many input files.

There could be other mistakes.

jd() { cd **/"$@"; }
2011-10-05 11:47:57
User: sharfah
Functions: cd
-3

Usage: jd dir

Requires globstar. To set globstar use:

shopt -s globstar
mplayer http://38.100.101.69/CIDCFMAAC
2010-03-13 17:42:54
User: dtolj
-3

Create a shortcut on your desktop and insert the above command.

vim -
2009-11-10 22:25:36
User: tmsh
Functions: vim
-3

I don't know if you've used sqsh before. But it has a handy feature that allows you to switch into vim to complete editing of whatever complicated SQL statement you are trying to run.

But I got to thinking -- why doesn't bash have that? Well, it does. It's called '|'!

Jk.

Seriously, I'm pretty sure this flow of commands will revolutionize how I administer files. And b/c everything is a file on *nx based distros, well, it's handy.

First, if your ls is aliased to ls --color=auto, then create another alias in your .bashrc:

alias lsp='ls --color=none'

Now, let's say you want to rename all files that begin with the prefix 'ras' to files that begin with a 'raster' prefix.

You could do it with some bash substitution. But who remembers that? I remember vim macros because I can remember to press 'qa' and how to move around in vim. Plus, it's more incremental. You can check things along the way. That is the secret to development and probably the universe. So type something like:

lsp | grep ras

Are those all the files you need to move? If not, modify and re-grep. If so, pipe it to vim.

lsp | grep ras | vim -

Now run your vim macros to modify the first line. Assuming you use 'w' and 'b' to move around, etc., it should work for all lines. Hold down '@@', etc., until your list of files has been modified from

ras_a.h

ras_a.cpp

ras_b.h

ras_b.cpp

to:

mv ras_a.h raster_a.h

mv ras_a.cpp raster_a.cpp

mv ras_b.h raster_b.h

mv ras_b.h raster_b.cpp

then run :%!bash

then run :q!

then be like, whaaaaa? as you realize your workflow got a little more continuous. maybe. YMMV.