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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.
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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:

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Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

All commands from sorted by
Terminal - All commands - 12,362 results
ioreg -l -p IODeviceTree | grep -o EFI[0-9]. && system_profiler SPSoftwareDataType |grep 64
gnome-terminal --tab --tab --tab
2009-09-03 19:36:07
User: 0disse0
Tags: terminal gnome
2

If you launch gnome-terminal manually, you can start with three open tabs

function checkfor () { while :; do $*; sleep 5; done; }
2009-09-03 19:35:42
User: relay
Functions: sleep
Tags: bash
1

checkfor: have the shell check anything you're waiting for.

'while : ; do' is an infinite loop

'$*' executes the command passed in

'sleep 5' - change for your tastes, sleep for 5 seconds

bash, ksh, likely sh, maybe zsh

Ctrl-c to break the loop

apt-key list
2009-09-03 19:32:11
User: 0disse0
Functions: apt
Tags: apt-key
0

For example: check the APT security keys to make sure the Google digital signature was imported correctly

apt-cache stats
man 5 crontab
2009-09-03 19:27:08
User: 0disse0
Functions: man
1

You can view the man pages from section five by passing the section number as an argument to the man command

function fcd () { [ -f $1 ] && { cd $(dirname $1); } || { cd $1 ; } pwd }
2009-09-03 18:58:13
User: relay
Functions: cd dirname pwd
Tags: bash ksh
1

fcd : file change directory

A bash function that takes a fully qualified file path and cd's into the directory where it lives. Useful on the commadline when you have a file name in a variable and you'd like to cd to the directory to RCS check it in or look at other files associated with it.

Will run on any ksh, bash, likely sh, maybe zsh.

find . -type f -exec grep -qi 'foo' {} \; -print0 | xargs -0 vim
2009-09-03 17:55:26
User: arcege
Functions: find grep xargs
Tags: vim find grep
-1

Make sure that find does not touch anything other than regular files, and handles non-standard characters in filenames while passing to xargs.

bash -x test.sh 2>&1 | tee out.test
2009-09-03 17:10:44
User: arcege
Functions: bash tee
3

Sends both stdout and stderr to the pipe which captures the data in the file 'out.test' and sends to stdout of tee (likely /dev/tty unless redirected). Works on Bourne, Korn and Bash shells.

echo $((3.0/5.0))
find . -exec grep foobar /dev/null {} \; | awk -F: '{print $1}' | xargs vi
grep -ir 'foo' * | awk -F '{print $1}' | xargs vim
grep -Hrli 'foo' * | xargs vim
2009-09-03 15:44:05
User: dere22
Functions: grep xargs
Tags: vim sed awk grep
3

The grep switches eliminate the need for awk and sed. Modifying vim with -p will show all files in separate tabs, -o in separate vim windows. Just wish it didn't hose my terminal once I exit vim!!

grep -ir 'foo' * | awk '{print $1}' | sed -e 's/://' | xargs vim
2009-09-03 15:12:27
User: elubow
Functions: awk grep sed xargs
Tags: vim sed awk grep
0

This will drop you into vim to edit all files that contain your grep string.

file /System/Library/Extensions/*.kext/Contents/MacOS/* |grep -i x86_64 |nl |tail -1 |cut -f1 -f3 && file /System/Library/Extensions/*.kext/Contents/MacOS/* |grep -v x86_64 |nl |tail -1 |cut -f1 -f3
2009-09-03 14:28:02
Functions: cut file grep nl tail
-1

Next time you see a mac fanboy bragging about 64-bitness of 10.6 give him this so he might sh?

O=$IFS;IFS=$'\n'; D=$(for f in *;do [[ -d $f ]] && du -sh "$f";done | sort -gr);F=$(for f in *;do [[ -f $f ]] && du -sh "$f";done | sort -gr);IFS=$O;echo "$D";echo "$F"
2009-09-03 11:39:50
User: Viperlin
Functions: du sort
-3

biggest->small directories, then biggest->smallest files

echo sortmeplease|sed 's/./&\n/g'|sort|tr -d '\n'
ls -lct /etc | tail -1 | awk '{print $6, $7}'
2009-09-03 10:26:37
User: MrMerry
Functions: awk ls tail
10

Show time and date when you installed your OS.

echo sortmeplease | awk '{l=split($1,a,"");asort(a);while(x<=l){printf "%s",a[x];x++ }print "";}'
2009-09-03 10:22:39
User: foob4r
Functions: awk echo
-1

using awk

missed the last char thanks @Josay

echo {1..199}" sheep," | espeak -v english -s 80
2009-09-03 10:08:12
User: MrMerry
Functions: echo
6

Can change language and speed, see espeak man page for options. (Install espeak in your linux distro via yum or apt-get)

For insomniacs you may need to enclose in a while true; do ...; done loop ;)

dd bs=1 seek=2TB if=/dev/null of=ext3.test
ls -shF --color
2009-09-03 05:45:33
User: Viperlin
Functions: ls
-3

use manpages, they give you "ultimate commands"

"ls -SshF --color" list by filesize (biggest at the top)

"ls -SshFr --color" list by filesize in reverse order (biggest at the bottom)

sudo dscl localhost -append /Local/Default/Groups/admin GroupMembership username
2009-09-03 04:40:10
User: kulor
Functions: sudo
0

adding users to groups on OS X is not a straightforward process, you need to use the new in built in Directory Service command line utility...

echo sortmeplease | grep -o . | sort | tr -d '\n'; echo
2009-09-03 00:52:49
User: MrMerry
Functions: echo grep sort tr
1

Sorts a character string, using common shell commands.

echo "5 k 3 5 / p" | dc
2009-09-03 00:21:54
User: xamaco
Functions: echo
2

using bc is for sissies. dc is much better :-D

Polish notation will rule the world...