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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.




Commands tagged bash from sorted by
Terminal - Commands tagged bash - 685 results
for y in {2009..2013}; do cal $y; done
find . -empty -type d -print0 | xargs -0 rmdir -p
2013-07-01 02:44:57
User: rafar
Functions: find rmdir xargs

It starts in the current working directory.

It removes the empty directory and its ancestors (unless the ancestor contains other elements than the empty directory itself).

It will print a failure message for every directory that isn't empty.

This command handles correctly directory names containing single or double quotes, spaces or newlines.

If you do not want only to remove all the ancestors, just use:

find . -empty -type d -print0 | xargs -0 rmdir
find . -type f ! -path \*CVS\* -exec rm {} \; -exec cvs remove {} \;
2013-06-28 20:17:40
User: jasonsydes
Functions: cvs find rm
Tags: bash cvs delete rm

This command removes and then cvs removes all files in the current directory recursively.

while true; do curl -vsL -o /dev/null example.com 2>&1 | grep 503 > /dev/null || echo "OK: server is up."; sleep 8; done
echo $[RANDOM % 2]
echo $[RANDOM % 100] # range 0-99
2013-05-25 19:02:00
User: anapsix
Functions: echo

use it to stagger cronjob or to get a random number

increase the range by replacing 100 with your own max value

du -mx [directory] | grep -P '^\d{4}' | sort -rn
2013-05-24 09:52:41
User: mc0e
Functions: du grep sort
Tags: bash Linux du

I don't like doing a massive sort on all the directory names just to get a small set of them. the above shows a sorted list of all directories over 1GB. use head as well if you want.

du's "-x" flag limits this to one file system. That's mostly useful when you run it on "/" but don't want "/proc" and "/dev" and so forth. Remember though that it will also exclude "/home" or "/var" if those are separate partitions.

the "-a" option is often useful too, for listing large files as well as large directories. Might be slower.

du -xB M --max-depth=2 /var | sort -rn | head -n 15
curl -k https://Username:Password@api.del.icio.us/v1/posts/all?red=api | xml2| \grep '@href' | cut -d\= -f 2- | sort | uniq | linkchecker -r0 --stdin --complete -v -t 50 -F blacklist
2013-05-04 17:43:21
User: bbelt16ag
Functions: cut sort uniq

This commands queries the delicious api then runs the xml through xml2, grabs the urls cuts out the first two columns, passes through uniq to remove duplicates if any, and then goes into linkchecker who checks the links. the links go the blacklist in ~/.linkchecker/blacklist. please see the manual pages for further info peeps. I took me a few days to figure this one out. I how you enjoy it. Also don't run these api more then once a few seconds you can get banned by delicious see their site for info. ~updated for no recursive

=() { echo $(($*)); }
2013-05-03 04:27:07
User: xlz
Functions: echo

POSIX compliant arithmetic evaluation.

= 10*2+3

xset dpms force off
xset dpms force standby
2013-04-24 22:46:51
User: doherty
Tags: bash xset

echo 'alias monitor_off="sleep 1; xset dpms force standby"' >> ~/.bash_aliases ; . ~/.bash_aliases # now monitor_off does what you think

/System/Library/CoreServices/Menu\ Extras/User.menu/Contents/Resources/CGSession -suspend
2013-04-23 14:27:10
User: zagdul
Tags: bash osx

This keeps the user logged in but shows the login screen. Very useful when connecting remotely to an OSX-Server via VNC

vim ~/.inputrc
2013-04-23 02:50:11
User: ekinertac
Functions: vim
Tags: bash search

This allows you to search through your history using the up and down arrows ? i.e. type "cd /" and press the up arrow and you'll search through everything in your history that starts with "cd /".

mkdir -p /path/to/folder.d; \cd $_
complete -C "perl -e '@w=split(/ /,\$ENV{COMP_LINE},-1);\$w=pop(@w);for(qx(screen -ls)){print qq/\$1\n/ if (/^\s*\$w/&&/(\d+\.\w+)/||/\d+\.(\$w\w*)/)}'" screen
2013-04-10 17:17:33
User: hubt
Tags: bash screen

this bash command sets it so that when you type "screen ", it searches your running screens, and present valid auto-complete choices. The output is .

Note: You must have programmable completion enabled. Check with "shopt progcomp", set with "shopt -s progcomp"

while read line; do export $line; done < <(cat input)
2013-03-15 08:14:04
User: dario
Functions: cat export read

This exports all lines of input file as environment variables, assuming each line is like these:



echo "ls" > script.bash; gpg -c script.bash; cat script.bash.gpg | gpg -d --no-mdc-warning | bash
2013-03-10 09:34:12
User: betsubetsu
Functions: cat echo gpg

echo "ls" > script.bash;

This is my script, a simple 'ls'.

gpg -c script.bash;

Here I encrypt and passord-protect my script. This creates file script.bash.gpg.

cat script.bash.gpg | gpg -d --no-mdc-warning | bash

Here I open file script.bash.gpg, decrypt it and execute it.

for i in `gpg --list-sigs | perl -ne 'if(/User ID not found/){s/^.+([a-fA-F0-9]{8}).*/\1/; print}' | sort | uniq`; do gpg --keyserver-options no-auto-key-retrieve --recv-keys $i; done
2013-03-10 09:15:15
User: hank
Functions: gpg perl sort
Tags: bash GPG sed fetch

The original command doesn't work for me - does something weird with sed (-r) and xargs (-i) with underscores all over...

This one works in OSX Lion. I haven't tested it anywhere else, but if you have bash, gpg and perl, it should work.

for i in *.flac; do gst-launch filesrc location="$i" ! flacdec ! audioconvert ! lamemp3enc target=quality quality=2 ! id3v2mux ! filesink location="${i%.flac}.mp3"; done
export HISTFILE=/dev/null
2013-02-18 16:37:01
User: sonic
Functions: export
Tags: history bash

just an alternative to setting the size, this allows you to scroll up and see your previous commands in a given session but when you logout the history is not saved. That's the only advantage to doing it this way..

diff -BI '^#' file{1,2}
if tmux has; then tmux attach -d; else tmux new; fi
2013-02-15 14:29:15
User: Casey
Tags: bash alias sh tmux

Also detaches session if attached from somewhere else.

diff -u <(grep -vE '^(#|$)' file1) <(grep -vE '^(#|$)' file2)
2013-02-12 13:59:39
Functions: diff grep

Runs a diff on two files ignore comments and blank lines (diff -I=RE does not work as expected). Adapted from a post found on stackexchange.

color()(set -o pipefail;"$@" 2>&1>&3|sed $'s,.*,\e[31m&\e[m,'>&2)3>&1