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

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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

Commands by bashrc from sorted by
Terminal - Commands by bashrc - 17 results
whatis $(compgen -c) 2>/dev/null | less
2013-02-01 00:03:33
User: bashrc
Functions: whatis

compgen -c finds everything in your path.

find . -mount -type f -printf "%k %p\n" | sort -rg | cut -d \ -f 2- | xargs -I {} du -sh {} | less
10,30,50 * * * * ping -c1 -w3 >/dev/null
2012-02-06 14:54:15
User: bashrc
Functions: ping

Cleaner with a mailto assignment in crontab (if the command fails you get an email):

[email protected]

10,30,50 * * * * ping -q -c1 -w3 >/dev/null

perl -i -ne 'print if $. == 3..5' <filename>
goo some things you search for < file
2011-09-09 20:30:40
User: bashrc

If you want to know which values from a list are used within a file.

Here's the bash function - called goo - for lack of a better name ;)

function goo() {

perl -e 'while (my $l = <STDIN>) { foreach (sort { length($b) <=> length($a) } @ARGV) { print "$_\n" x $l =~ s/$_//ig; } }' "$@"


perl -ne '$. == 4 && print && exit'
2011-09-05 21:52:16
User: bashrc
Functions: perl

Perl version - just for completeness sake ;)

cat file.csv | perl -pe 'if($. == 1) [email protected] = split(/;/); $i = 1 ; map { $_ = $i; $i++ } @h; print join(" ;", @h) , "\n"} ; s/(^|;);/$1 ;/g' | column -ts\; | less -S
column -tns: /etc/passwd
2011-08-31 10:47:04
User: bashrc
Functions: column
Tags: column

-n switch keeps empty columns

If your distribution does not ship with a recent column version that supports -n you can use this alternative:

perl -pe 's/(^|;);/$1 ;/g' file.csv | column -ts\; | less -S

Change the delimiter to your liking.

perl -ne 'print "$1 " if /^Host (.+)$/' ~/.ssh/config
2011-08-21 14:51:20
User: bashrc
Functions: perl

I use this in my bashrc to expand hosts defined in ~/.ssh/config:

function _ssh_completion() {

perl -ne 'print "$1 " if /^Host (.+)$/' ~/.ssh/config


complete -W "$(_ssh_completion)" ssh

Here's a great article on how to setup your own ~/.ssh/config:


perl -dwe 1
2011-05-05 20:28:03
User: bashrc
Functions: perl

Can also just use the debug mode like this.

mysql --pager="less -niSFX"
echo ${SSH_CLIENT%% *}
readlink -e /bin/ls
2011-01-04 14:55:33
User: bashrc
Functions: readlink

Part of coreutils - so needs no extra package...

cd $srcdir && find -type d -exec mkdir -p $dstdir/{} \;
2010-12-18 12:13:39
User: bashrc
Functions: cd find mkdir
Tags: copy

Clone directory structure without the files

ls -F | grep '*$'
netstat -atn | perl -0777 -ne [email protected] = /tcp.*?\:(\d+)\s+/imsg ; for $port (32768..61000) {if(!grep(/^$port$/, @ports)) { print $port; last } }'
2010-12-14 20:44:37
User: bashrc
Functions: last netstat perl

Not really better - just different ;)

There's probably a really simple solution out there somewhere...