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.


If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/

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

Hide

Credits

Commands tagged bash from sorted by
Terminal - Commands tagged bash - 724 results
/originalInstall/gem list | tr -d '(),' | xargs -L 1 sudo ./gemInst.sh
2009-07-09 21:46:06
User: snakerdlk
Functions: sudo tr xargs
Tags: bash Linux
0

gemInst.sh:

#!/bin/bash

for i in $@; do

if [ "$1" != "$i" ]

then

echo /newInstall/gem install $1 -v=\"$i\"

/newInstall/gem install $1 -v="$i"

if [ "$?" != "0" ]

then

echo -e "\n\nGEM INSTALL ERROR: $1\n\n"

echo "$1" > gemInst.err

fi

fi

done

export IFS=$(echo -e "\n")
2009-07-09 15:25:37
User: darkpand
Functions: echo export
8

When you use a "for" construct, it cycles on every word. If you want to cycle on a line-by-line basis (and, well, you can't use xargs -n1 :D), you can set the IFS variable to .

l=500; x=500; y=200; d=-15;for i in `seq $x $d $y`; do beep -l $l -f $i;done
2009-07-07 22:12:20
Tags: bash beep sound
0

Generates a frequency sweep from $x to $y, with $d numbers inbetween each step, and with each tone lasting $l milliseconds.

? () { echo "$*" | bc -l; }
2009-06-28 20:15:30
User: fizz
Functions: bc echo
57

defines a handy function for quick calculations from cli.

once defined:

? 10*2+3
for i in *;do mv "$i" "$(echo $i | sed s/PROBLEM/FIX/g)";done
2009-06-28 01:50:25
User: AlecSchueler
Functions: mv
3

Useful if non-ascii characters in filenames have been improperly encoded. Replace "PROBLEM" with the incorrect characters (e.g. 'é'), and "FIX" with the correct ones (e.g. '?').

echo {0..1}{0..1}{0..1}{0..1}
2009-06-23 17:30:20
User: dennisw
Functions: echo
17

If you should happen to find yourself needing some binary numbers, this is a quickie way of doing it. If you need more digits, just add more "{0..1}" sequences for each digit you need. You can assign them to an array, too, and access them by their decimal equivalent for a quickie binary to decimal conversion (for larger values it's probably better to use another method). Note: this works in bash, ksh and zsh. For zsh, though, you'll need to issue a setopt KSH_ARRAYS to make the array zero-based.

binary=({0..1}{0..1}{0..1}{0..1})

echo ${binary[9]}
(Command too long..See sample Output..)
2009-06-14 20:34:37
User: mohan43u
Tags: bash sed echo tr od
-3

curl doesn't provide url-encoding for 'GET' data, it have an option '--data-urlencode', but its only for 'POST' data. Thats why I need to write down this commandline. With 'perl', 'php' and 'python', this is one liner, but just I wrote it for fun. Works in Ubuntu, will work in all linux varients(I hope it will work in unix varients also).

a=`printf "%*s" 16`;b=${a//?/{0..1\}}; echo `eval "echo $b"`
chronic () { t=$1; shift; while true; do $@; sleep $t; done & }
2009-06-13 05:57:54
User: rhythmx
Functions: sleep
3

Chronic Bash function:

chronic 3600 time # Print the time in your shell every hour chronic 60 updatedb > /dev/null # update slocate every minute

Note: use 'jobs' to list background tasks and fg/bg to take control of them.

FILENAME=${FILE##*/};FILEPATH=${FILE%/*};NOEXT=${FILENAME%\.*};EXT=${FILE##*.}
URL=http://svn.example.org/project; diff -u <(TZ=UTC svn -q log -r1:HEAD $URL | grep \|) <(TZ=UTC svn log -q $URL | grep \| | sort -k3 -t \|)
2009-06-03 14:26:55
User: sunny256
Functions: diff grep sort
Tags: bash svn
2

Lists revisions in a Subversion repository with a timestamp that doesn't follow the revision numbering order. If everything is OK, nothing is displayed.

for k in `git branch|perl -pe s/^..//`;do echo -e `git show --pretty=format:"%Cgreen%ci %Cblue%cr%Creset" $k|head -n 1`\\t$k;done|sort -r
2009-06-03 08:25:00
User: brunost
Functions: echo head perl sort
15

Print out list of all branches with last commit date to the branch, including relative time since commit and color coding.

svn log fileName|cut -d" " -f 1|grep -e "^r[0-9]\{1,\}$"|awk {'sub(/^r/,"",$1);print "svn cat fileName@"$1" > /tmp/fileName.r"$1'}|sh
2009-05-27 02:11:58
User: fizz
Functions: awk cut grep
Tags: bash svn awk grep
2

exported files will get a .r23 extension (where 23 is the revision number)

sed -e's/%\([0-9A-F][0-9A-F]\)/\\\\\x\1/g' | xargs echo -e
2009-05-25 05:37:44
User: mohan43u
Functions: echo sed xargs
10
echo "http%3A%2F%2Fwww.google.com" | sed -e's/%\([0-9A-F][0-9A-F]\)/\\\\\x\1/g' | xargs echo -e

http://www.google.com

Works under bash on linux. just alter the '-e' option to its corresponding equivalence in your system to execute escape characters correctly.

diff -uw <(fmt -1 {file1, file2})
2009-05-23 03:11:08
User: sunny256
Functions: diff fmt
Tags: bash diff
3

It can be hard to spot differences in reformatted files, because of all the diff noise created by word wrapped lines. This command removes all the noise and performs a word-by-word diff. To ignore empty lines, add -B to the diff command. Also, if this is something you do often, you might want to check out the wdiff(1) program.

echo $BASH_VERSION
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
30

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

cd "$(mktemp -d)"
2009-05-20 11:48:12
User: Weboide
Functions: cd
Tags: bash directory
8

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

expanded_script=$(eval "echo \"$(cat ${sed_script_file})\"") && sed -e "${expanded_script}" your_input_file
2009-05-07 14:21:14
Functions: eval sed
-1

With this command you can use shell variables inside sed scripts.

This is useful if the script MUST remain in an external file, otherwise you can simply use an inline -e argument to sed.

screen -d -m nautilus --no-desktop `pwd`
2009-05-07 00:49:07
User: windsurfer
Functions: screen
-10

This opens up nautilus in the current directory, which is useful for some quick file management that isn't efficiently done from a terminal.

PS1="$BLUE[$CYAN\u$BLUE@$CYAN\h$WHITE-bash \v:$GREEN\w$BLUE]$WHITE \$ "
2009-05-06 08:01:06
User: P17
Tags: bash
-3

The colors are defined as variables.

e.g.

RED="\[\033[01;31m\]"

BLUE="\[\033[01;34m\]"

shopt -s globstar
2009-05-05 16:02:44
User: Alanceil
11

Since bash 4.0, you can use ** to recursively expand to all files in the current directory. This behaviour is disabled by default, this command enables it (you'd best put it in your .profile). See the sample output for clarification.

In my opinion this is much better than creating hacks with find and xargs when you want to pass files to an application.

alias somafm='read -p "Which station? "; mplayer --reallyquiet -vo none -ao sdl http://somafm.com/startstream=${REPLY}.pls'
2009-05-05 12:13:46
User: denzuko
Functions: alias
-2

This is the alias command that I discussed in my prior release which you can add to your ~/.bashrc.

This command asks for the station name and then connects to somafm, Great for those who have linux home entertainment boxes and ssh enabled on them, just for the CLI fiends out there ( I know I'm one of them ;)

You can find future releases of this and many more scripts at the teachings of master denzuko - denzuko.co.cc.

lynx -dump randomfunfacts.com | grep -A 3 U | sed 1D
2009-05-05 07:52:10
User: xizdaqrian
Functions: grep sed
0

This is a working version, though probably clumsy, of the script submitted by felix001. This works on ubuntu and CygWin. This would be great as a bash function, defined in .bashrc. Additionally it would work as a script put in the path.

export LSCOLORS=gxfxcxdxbxegedabagacad
2009-05-04 04:07:36
User: haivu
Functions: export
Tags: bash ls osx
2

I use terminal with black background on the Mac. Unfortunately, the default ls color for the directory is blue, which is very hard to see. By including the line above in my ~/.bash_profile file, I changed the directory's color to cyan, which is easer to see. For more information on the syntax of the LSCOLORS shell variable:

man ls

I tested this command on Mac OS X Leopard