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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!

Top Tags



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 - 12,408 results
passpdf(){ for i; do qpdf --password=<YOUR PASSWD> --decrypt "$i" "new$i"; done; }
2010-02-25 01:21:00
User: sputnick
Tags: pdf qpdf

You should install qpdf.

That way, you can have a copy without any password required.

find -D rates . -name "*.mp3" -type f
for i in `grep -n "SomeRegEx" foo.txt | sed 's/:/ /' | awk '{print $1}'`; do echo "head -n `echo "$i+4" | bc` foo.txt | tail -n 5"; done > headsandtails.sh
2010-07-01 05:48:02
User: reklis
Functions: awk echo sed

Finds the line number matching the regex, then passes that to BC for some math, passes that to head, and uses tail to trim off the unwanted section at the top. The whole thing is spit out to a script that can then be shared or run. Comes in handy for reading select sections from error logs.

cgrep() { GREP_COLOR="1;3$((RANDOM%6+1))" grep --color=always "$@" }
2011-03-04 18:45:58
User: derekschrock
Functions: grep
Tags: grep

Randomize GNU grep's colors 31-36 excluding black and white.

perl -ne [email protected]=split(/,/); $b=0; foreach $r (1..$#a){ $b+=$a[$r] } print "$a[0],$b\n"' -f file.csv
2015-09-04 21:05:56
User: miniker84
Functions: perl

For all lines, sum the columns following the first one, and then print the first column plus the sum of all the other columns.

example input:






alias acs='apt-cache search'
wget -H -r ?level=1 -k -p http://www.domain.com/folder/
2009-12-27 05:23:27
User: svnlabs
Functions: wget

wget ? server to server files transfer

kded --version | awk -F: 'NR == 2 {print $2}' | sed 's/\s\+//g'
2012-01-17 17:44:23
User: voyeg3r
Functions: awk sed

kded --version return this

Qt: 3.3.8b

KDE: 3.5.10

KDE Daemon: $Id: kded.cpp 711061 2007-09-11 09:42:51Z tpatzig $

awk -F: ................. Awk Field separator

NR == 2 ................. Register Number, second line

{print $2} ............... second field

sed 's/\s\+//g' .......... remove one space or more \s\+ changing by nothing

sudo lsof -i -n | grep sshd | grep sshuser | grep :[PORT-RANGE] | grep -v IPv6 | awk -F\: '{print $2}' | grep -v http | awk -F" " '{print $1}'
2015-04-09 15:41:11
User: das_shark
Functions: awk grep sshd sudo

gets network ports

only ones for the sshd service

only logged in a specific user (changed for public posting)

only in a specific localhost:port range

not IPv6

Only the part of the response after the ":" character

Only the part of the response before the 1st space

Output is just the rssh port

long_command; say I am all done
2010-01-27 19:03:01
User: haivu
Tags: audio osx

I often run some command that takes a while to finish. By putting the say command afterward, I get an audio notification.

Please note that this command (say) only works on Mac OS X and not Linux.

ls | while read filename; do tar -czvf "$filename".tar.gz "$filename"; rm "$filename"; done
2010-03-29 08:10:38
User: Thingymebob
Functions: ls read rm tar

Compresses each file individually, creating a $fileneame.tar.gz and removes the uncompressed version, usefull if you have lots of files and don't want 1 huge archive containing them all. you could replace ls with ls *.pdf to just perform the action on pdfs for example.

cryptmount -m <name>
2012-01-17 18:02:47
User: totti

In order to create a new encrypted filing system managed by cryptmount,

you can use the supplied 'cryptmount-setup' program, which can be used

by the superuser to interactively configure a basic setup.

Alternatively, suppose that we wish to setup a new encrypted filing

system, that will have a target-name of "opaque". If we have a free

disk partition available, say /dev/hdb63, then we can use this directly

to store the encrypted filing system. Alternatively, if we want to

store the encrypted filing system within an ordinary file, we need to

create space using a recipe such as:

dd if=/dev/zero of=/home/opaque.fs bs=1M count=512


cryptmount --generate-key 32 opaque


cryptmount --prepare opaque


mke2fs /dev/mapper/opaque


cryptmount --release opaque


mkdir /home/crypt


cryptmount -m opaque


cryptmount -u opaque

For detail see sample output

synclient TouchPadOff=1
netstat -anp | grep :80 | grep ESTABLISHED | wc -l
2015-04-10 19:32:31
User: krizzo
Functions: grep netstat wc
Tags: session

This counts all established sessions on port 80. You can change :80 to any port number you want to check.

SEARCHPATH=/var/; find $SEARCHPATH -type d -print0 | xargs -0 du -s 2> /dev/null | sort -nr | sed 's|^.*'$SEARCHPATH'|'$SEARCHPATH'|' | xargs du -sh 2> /dev/null
2011-07-06 08:21:58
User: moogmusic
Functions: du find sed sort xargs

This command lists all the directories in SEARCHPATH by size, displaying their size in a human readable format.

synclient TouchPadOff=0
2009-02-17 01:23:39
User: roliver

Files saved on a windows machine use different ascii characters for lines turns. When viewing such files in VI the will most often have a ^M(control-VM) character at the end of each line. This command will remove all occurrences of that character

man emacs
2011-08-17 00:37:00
User: cwimmer
Functions: man

Emacs backs up previous versions by default.

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

i="0"; while [ $i -lt 5 ] ; do xpenguins & i=$[$i+1] ; done
2009-12-27 21:05:33
User: eastwind

just replace the number 5 with the variable you want , and the xpenguins software with the one you want

echo -n "String to MD5" | md5sum | cut -f1 -d' '
2011-03-05 03:53:09
User: xakon
Functions: cut echo md5sum

Nothing special about hashing here, only the use of cut, I think, could result at fewer keystrokes.

ls -ltr |grep 'May 12'|awk '{print $9;}'|xargs rm -v
find -iname '*.flac' | sed 's:/[^/]*$::' | uniq
2009-03-24 13:26:31
User: ar
Functions: find sed

Run this in your music folder, or give the path directly after "find".

The sed pattern filters away the basename.

html2text http://checkip.dyndns.org | grep -i 'Current IP Address:'|cut -d' ' -f4
2009-08-06 11:30:32
User: adonis28850
Functions: cut grep

The same as the other user, but smarter, using -d and -f

dd if=/dev/zero of=filename.file bs=1024 count=10240
2012-01-19 08:38:14
User: harpo
Functions: dd

Command to create a dummy file (full of nulls). Useful for testing e.g. file transfers when no file is at hand.

bs = blocksize, count = filesize in kilobytes