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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
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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:

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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 - 12,353 results
system_profiler SPApplicationsDataType | perl -nl -e [email protected]=<>; [email protected]; while($j<$c){ $apps[$i].=$al[$j]; $i++ if ($al[$j] ) =~ /^\s\s\s\s\S.*:$/; $j++} while($k<$i){ $_=$apps[$k++]; if (/Kind: PowerPC/s) {print;}}'
2009-09-06 20:56:48
User: drewk
Functions: perl
Tags: Os X perl
0

This finds all the PowerPC apps recognized by OS X.

A better version is:

system_profiler SPApplicationsDataType 2> /dev/null | perl -

wnl -e '$i=$j=$k=$p=0; @al=; [email protected]; while($j

s[$i].=$al[$j]; $i++ if ($al[$j]) =~ /^\s\s\s\s\S.*:$/; $j++} while($k

apps[$k++]; if (/Kind: PowerPC/s) {print; $p++;}} print "$i applications, $p P

owerPC applications\n\n"'

but that is more than 255 characters...

find . -name '*.html' -exec 'sed' 's/.*class="\([^"]*\?\)".*/\1/ip;d' '{}' ';' |sort -su
2009-09-06 18:43:18
User: kamathln
Functions: find sort
1

Lists out all classes used in all *.html files in the currect directory. usefull for checking if you have left out any style definitions, or accidentally given a different name than you intended. ( I have an ugly habit of accidentally substituting camelCase instead of using under_scores: i would name soemthing counterBox instead of counter_box)

WARNING: assumes you give classnames in between double quotes, and that you apply only one class per element.

find . -regex '.*\(h\|cpp\)'
2009-09-06 11:33:19
User: Vereb
Functions: find
Tags: bash find
7

This is the way how you can find header and cpp files in the same time.

prev=0;next=1;echo $prev;while(true);do echo $next;sum=$(($prev+$next));prev=$next;next=$sum;sleep 1;done
while [ -n "`pgrep wget`" ]; do sleep 2 ;done; [ -e "/tmp/nosleep"] || echo mem >/sys/power/state
2009-09-06 05:51:20
User: kamathln
Functions: echo sleep
1

[Note: This command needs to be run as root].

If you are downloading something large at night, you can start wget as a normal user and issue the above command as root. When the download is done, the computer will automatically go to sleep. If at any time you feel the computer should not go to sleep automatically(like if you find the download still continuing in the morning), just create an empty file called nosleep in /tmp directory.

curl -Is slashdot.org | sed -ne '/^X-[FBL]/s/^X-//p'
awk 'BEGIN {a=1;b=1;for(i=0;i<'${NUM}';i++){print a;c=a+b;a=b;b=c}}'
2009-09-06 03:05:55
User: arcege
Functions: awk
Tags: awk
0

Does not require input to function or complete. Number of iterations controlled by shell variable $NUM.

<ctrl-shift-t>
2009-09-05 18:01:32
User: tobiasboon
Tags: firefox
-10

This is really not cli but I think it's neat.

alias ':q'='exit'
2009-09-05 17:59:50
User: tobiasboon
Functions: alias
Tags: vim alias exit :q
9

Put this in your ~/.bashrc file (or the equivalent)

If you use vim a lot, this alias will be immediately obvious. Your brain will thank you.

<ctrl-f> in ex mode in vim
2009-09-05 14:43:15
User: Vereb
Functions: ex
Tags: vim
4

If you are in ex mode in vim i.e. you've pressed ':'. You can edit the current command by pressing <ctrl-f>

lspci -v | perl -ne '/VGA/../^$/ and /VGA|Kern/ and print'
grep -oE "ssid=\".*\"" /etc/wpa_supplicant.conf | cut -c6- | sed s/\"//g | zenity --list --title="Choose Access Point" --column="SSID"
2009-09-05 10:41:05
Functions: cut grep sed
1

If you still connect to your wireless access point manually and need to use wpa_supplicant, the above fu will grep all of the known SSID from your wpa_supplicant.conf file, present it in a Zenity list and return the SSID name you choose. I've wrapped this command in to a bash script that then up's the interface, associates and autenticates. Saves me from using NetworkManager ;)

dd if=/dev/cdrom of=whatever.iso
2009-09-05 09:19:41
User: 0disse0
Functions: dd
Tags: backup dd iso dvd
8

A dear friend of mine asked me how do I copy a DVD to your hard drive? If you want to make a copy of the ISO image that was burned to a CD or DVD, insert that medium into your CD/DVD drive and (assuming /dev/cdrom is associated with your computer?s CD drive) type the following command

sudo dd if=/dev/hda1 of=/dev/hdb2
2009-09-05 09:16:52
User: 0disse0
Functions: dd sudo
5

This command clone the first partition of the primary master IDE drive to the second partition

of the primary slave IDE drive (!!! back up all data before trying anything like this !!!)

od -vt x1 /tmp/spaghettifile
sudo mknod /dev/ttyS4 c 4 68
2009-09-05 09:12:44
User: 0disse0
Functions: c++ mknod sudo
Tags: serial mknod tty
0

When you need to add another tty device that can automatically start at boot time

yes "$(seq 1 255)" | while read i; do printf "\x1b[48;5;${i}m\n"; sleep .01; done
echo capitalize | { dd bs=1 count=1 conv=ucase 2> /dev/null; cat ;}
curl -d api_key="$api_key" -d user_app_key="$user_app_key -d body="$body" -d post_method="default" http://api.ping.fm/v1/user.post
2009-09-04 23:20:33
User: matthewbauer
2

Updates your Ping.fm status and websites supported by ping.fm (like twitter, facebook, and google talk).

echo "SECRET MESSAGE" | gpg -e --armor -s | sendmail [email protected]
2009-09-04 20:47:12
User: flip387
Functions: echo gpg sendmail
3

A very simple command to send a signed and encrypted message from the command line using GPG Keys

[ "$1" == "--help" ] && { sed -n -e '/^# Usage:/,/^$/ s/^# \?//p' < $0; exit; }
2009-09-04 20:36:06
User: syladmin
Functions: sed
9

With this one liner you can easily output a standard help message using the following convention:

Usage: is the start marker

Stop at the last #

for x in *.ogg; do ffmpeg -i "$x" "`basename "$x" .ogg`.mp3"; done
2009-09-04 20:23:09
User: Superhuman
Tags: ffmpeg ogg mp3 for
-1

Converts all ogg files to mp3 files in the current directory.

cat /etc/passwd | openssl aes-256-cbc -a -e -pass pass:password | netcat -l -p 8080
2009-09-04 20:04:24
User: flip387
Functions: cat
10

Using OpenSSL we can encrypt any input we wish and then use Netcat to create a socket which can be connected to from an externally source (even using a Web Browser)

vimdiff <(svn cat "$1") "$1"
2009-09-04 18:41:40
User: plasticboy
Functions: cat
Tags: svn vim diff color
2

This will diff your local version of the file with the latest version in svn. I put this in a shell function like so:

svd() { vimdiff <(svn cat "$1") "$1"; }
find . -name .svn -prune -o -print
2009-09-04 17:41:33
User: arcege
Functions: find
Tags: svn find
6

Put the positive clauses after the '-o' option.