Commands using echo sorted by votes

Commands using echo (1,545)

sorted by

Rickroll your users who try to sudo
This is sample output - yours may be different.
-2

echo "alias sudo=\"aplay annoyingsoundfile.ogg\"" >> .bash_aliases

Davidc3 · 2010-06-16 10:20:15 5
Get your external IP address

Here's a version that uses netcat (although I'd much rather use curl!).
This is sample output - yours may be different.
-2

echo -e "GET /ip HTTP/1.0\nUser-Agent: netcat\nHOST: ifconfig.me\n\n" | nc ifconfig.me 80 | sed -n '/^[0-9]/p'

putnamhill · 2010-06-16 19:08:05 3
Read multiple lines of a file based on regex matching a single line

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.
This is sample output - yours may be different.
-2

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

reklis · 2010-07-01 05:48:02 5
Minimize CSS/JS while preserving functionality.

This command, or a derivative like it, is a must-have if you're a server administrator interested in website optimization: https://kinqpinz.info/?%C2%B6=287a7ba6 Command requires Yahoo's YUI, find it here: http://developer.yahoo.com/yui/ Show Sample Output
This is sample output - yours may be different.
```
% gominify c.css c-min.css 
Saved c.css (12K) to c-min.css (8.0K)
```
-2

gominify() { if [ $# -ne 2 ]; then echo 'gominify < src > < dst >'; return; fi; s="$1"; d="$2"; java -jar yui.jar $s >$d; if [ $? == 0 ]; then a=$( ls -sh $s | awk '{print $1}' ); b=$( ls -sh $d | awk '{print $1}' ); echo "Saved $s ($a) to $d ($b)"; fi;}

meathive · 2010-08-03 10:19:24 3
Random number less than X
This is sample output - yours may be different.
-2

RANGE=500;number=$RANDOM let "number %= $RANGE"; echo "Random number less than $RANGE --- $number"

4fthawaiian · 2010-08-06 13:16:52 3
MS-DOS only: Loop over array of system variable with each var containing multiple values

Loops over array of a system var, splits its values and puts the values into %A, %B, %C, %D, and so on. Create array before, like set ARRAY[0]=test1,100 and set ARRAY[1]=test2,200 Be sure to replace %A, %B, etc. with %%A, %%B, etc. when using this from inside of batch files. Show Sample Output
This is sample output - yours may be different.
```
test1 -- 100
test2 -- 200
```
-2

FOR /F "tokens=3* delims=[]=," %A IN ('SET ARRAY[') DO ( echo %A -- %B )

Marco · 2010-08-10 12:12:27 5
count number of CPU available for members of a given Virtual Organization

Of course, this command must be executed at a GRID User Interface lhcb - name of your VO, substitute it with the one you are interested it. Show Sample Output
This is sample output - yours may be different.
```
1388123
```
-2

echo `lcg-infosites --vo lhcb ce | cut -f 1| grep [[:digit:]]| tr '\n' '+' |sed -e 's/\ //g' -e 's/+$//'`|bc -l

kbat · 2010-11-10 15:06:00 3
alias ps | grep

This is an attempt to get a command which I can alias. It's ugly but it works. I'm hoping someone can suggest a cleaner version. I have tried.... # alias kfire="for i in $( ps aux | grep [F]irefox | awk \'{print $2}\' ); do kill $; done" # alias kfire=`kill $(ps aux | grep [F]irefox | awk '{print $2}' | tr '\n' ' ')` # alias kfire='ps au | grep -i [F]irefox | awk \'{ print $2 \'} ' and they all fail in a .bashrc I've tried escaping the quotes and can't find a way to make the single quotes ' that awk wants work. Maybe I'm just stubborn but I don't want to put in a little #!/bin/bash file just so I can kill a firefox process all in one stroke. This script works (it kills the process before it errors out)... it's just ugly and there may be a pretty way to do this. Show Sample Output
This is sample output - yours may be different.
```
$ kfire
swerve
17165
1.6
-bash: 1.6: syntax error: invalid arithmetic operator (error token is ".6")
```
-2

alias kfire='for i in `ps aux | grep [F]irefox `; do echo $i; kill $(($i)); done; '

swerve · 2010-12-27 01:47:58 15
a simple bash one-liner to create php file and call php function

created and tested on: ProductName: Mac OS X ProductVersion: 10.6.5 BuildVersion: 10H574 Show Sample Output
This is sample output - yours may be different.
```
Uryyb Jbeyq
```
-2

echo '<?php echo str_rot13 ("Hello World") ?>' > hw.php && php hw.php && rm hw.php

IsraelTorres · 2011-01-04 21:15:19 3
Show last argument

used to output the last argument. www.fir3net.com Show Sample Output
This is sample output - yours may be different.
```
[root@server ~]# mkdir /root/test
[root@server ~]# cd !$
cd /root/test
```
-2

echo !$

felix001 · 2011-02-21 21:05:56 3
Add a list of numbers
This is sample output - yours may be different.
-2

echo "1 2 3+p" | dc

abc · 2011-02-28 01:06:06 3
Generate MD5 of string and output only the hash checksum

Nothing special about hashing here, only the use of cut, I think, could result at fewer keystrokes. Show Sample Output
This is sample output - yours may be different.
```
23e4a2a9d1c125733a2e6b797f7f54ef
```
-2

echo -n "String to MD5" | md5sum | cut -f1 -d' '

xakon · 2011-03-05 03:53:09 4
bookmarklet for commandlinefu.com search

If you add the bookmarklet to your browser's bookmarks with like say, the keyword 'cfu', you can for example type 'cfu hello' in the location bar and the %s gets replaced with 'hello'. The bookmarklet will convert the search text to base64 for use with the commandlinefu website and will take you there. Tested with Firefox. Show Sample Output
This is sample output - yours may be different.
```
javascript:location.href='http://www.commandlinefu.com/commands/matching/'+encodeURIComponent('%s')+'/'+btoa('%s')+'/sort-by-votes'

(the echo doesn't do anything special, but it had to be a command, right?)
```
-2

echo "javascript:location.href='http://www.commandlinefu.com/commands/matching/'+encodeURIComponent('%s')+'/'+btoa('%s')+'/sort-by-votes'"

darkfader · 2011-03-07 22:01:46 4
Selecting a random file/folder of a folder

Choose random file from current folder. Avoids using ls.
This is sample output - yours may be different.
-2

for i in *; do echo "$i"; done | shuf -n1

johnraff · 2011-03-17 17:48:42 6
Lowercase to Uppercase

Convert text from lowercase to uppercase Show Sample Output
This is sample output - yours may be different.
```
TEST
```
-2

echo "test" | sed 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'

lightuono · 2011-04-05 09:52:37 15
shutdown pc in a 4 hours

Benefit is that it doesn't make you keep the terminal open.
This is sample output - yours may be different.
-2

echo "shutdown -h now" | sudo at now + 4 hours

depesz · 2011-05-02 15:29:48 3
Echo PID of the current running command

Actually $! is an internal variable containing PID of the last job in background. More info: http://tldp.org/LDP/abs/html/internalvariables.html#PIDVARREF Using $! for job control: possibly_hanging_job & { sleep ${TIMEOUT}; eval 'kill -9 $!' &> /dev/null; }
This is sample output - yours may be different.
-2

command & echo $!

Mahrud · 2011-06-08 18:16:38 3
Get the rough (german) time from Twitter

EXACT time in Germany. :) Show Sample Output
This is sample output - yours may be different.
```
Berlin Date/Time is Sun 19 Jun 2011 04:35:30 AM GMT
```
-2

echo -e "Berlin Date/Time is" `TZ=GMT-2 /bin/date \+%c`

Habitual · 2011-06-19 02:40:31 3
Grep with one result at a time

Not perfect but working (at least on the project i wrote it ;) ) Specify what you want search in var search, then it grep the folder and show one result at a time. Press enter and then it will show the next result. It can work bad on result in the firsts lines, and it can be improved to allow to come back. But in my case (a large project, i was checking if a value wasn't used withouth is corresponding const and the value is "1000" so there was a lot of result ...) it was perfect ;)
This is sample output - yours may be different.
-2

search="whatyouwant";data=$(grep "$search" * -R --exclude-dir=.svn -B2 -A2);for((i=$(echo "$data" | wc -l);$i>0;i=$(($i-6)) )); do clear;echo "$data"| tail -n $i | head -n 5; read;done

Juluan · 2011-08-29 18:14:16 4
Get memory total from /proc/meminfo in Gigs

Probably more trouble than its worth, but worked for the obscure need.
This is sample output - yours may be different.
-2

memnum=$(awk '{ print $2 }' /proc/meminfo |head -n1); echo "$memnum / 1024 / 1024" | bc -l

wekoch · 2011-11-08 16:28:25 3
add title and alt-text to your collection of xkcd comics

full command: for fn in xkcd*.png xkcd*.jpg; do; echo $fn; read xw xh <<<$(identify -format '%w %h' $fn); nn="$(echo $fn | sed 's/xkcd-$[0-9]\+$-.*/\1/')"; wget -q -O xkcd-${nn}.json http://xkcd.com/$nn/info.0.json; tt="$(sed 's/.*"title": "$[^"]*$", .*/\1/' xkcd-${nn}.json)"; at="$(sed 's/.*alt": "$.*$", .*/\1/' xkcd-${nn}.json)"; convert -background white -fill black -font /usr/share/fonts/truetype/freefont/FreeSansBold.ttf -pointsize 26 -size ${xw}x -gravity Center caption:"$tt" tt.png; convert -background '#FFF9BD' -border 1x1 -bordercolor black -fill black -font /usr/share/fonts/truetype/freefont/FreeSans.ttf -pointsize 16 -size $(($xw - 2))x -gravity Center caption:"$at" at.png; th=$(identify -format '%h' tt.png); ah=$(identify -format '%h' at.png); convert -size ${xw}x$(($xh+$th+$ah+5)) "xc:white" tt.png -geometry +0+0 -composite $fn -geometry +0+$th -composite at.png -geometry +0+$(($th+$xh+5)) -composite ${fn%\.*}_cmp.png; echo -e "$fn $nn $xw $xh $th $ah \n$tt \n$at\n"; done this assumes that all comics are saved as xkcd-[number]-[title].{png|jpg}. it will then download the title and alt-text, create pictures from them, and put everything together in a new png-file. it's not perfect, but it worked for nearly all my comics. it uses the xkcd-json-interface. though it's poorly written, it doesn't completely break on http://xkcd.com/859/
This is sample output - yours may be different.
-2

for fn in xkcd*.png xkcd*.jpg; do echo $fn; read xw xh <<<$(identify -format '%w %h' $fn); nn="$(echo $fn | sed 's/xkcd-$[^-]\+$-.*/\1/')"; wget -q -O xkcd-${nn}.json http://xkcd.com/$nn/info.0.json; tt="$(sed 's/.*"title": "$[^"]\+$",.*/\1/' ...

fpunktk · 2012-01-06 20:26:11 8
Prefix file contents with filename
This is sample output - yours may be different.
-2

for i in $(seq 1 20); do while read line; do echo "$i: $line"; done<$i.py; done

evandrix · 2012-03-09 01:06:50 3
Add a custom package repository to apt sources.list

For instance, to add mongodb 10gen package echo "deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen" | sudo tee -a /etc/apt/sources.list Show Sample Output
This is sample output - yours may be different.
```
[some repository]
```
-2

echo "[some repository]" | sudo tee -a /etc/apt/sources.list

jjperezaguinaga · 2012-04-21 17:54:08 5
Convert HH:MM:SS into seconds

Show Sample Output
This is sample output - yours may be different.
```
1776
```
-2

echo 00:29:36 | sed s/:/*60+/g | bc

debyatman · 2012-08-11 00:47:47 21
How to execute and encrypted and password-protected bash script?

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.
This is sample output - yours may be different.
-2

echo "ls" > script.bash; gpg -c script.bash; cat script.bash.gpg | gpg -d --no-mdc-warning | bash

betsubetsu · 2013-03-10 09:34:12 9
‹ First < 55 56 57 58 59 > Last ›

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

Insert a line for each n lines

specially usefull for sql scripts with insert / update statements, to add a commit command after n statements executed.

list files recursively by size

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Print every Nth line

Sometimes commands give you too much feedback. Perhaps 1/100th might be enough. If so, every() is for you. $ my_verbose_command | every 100 will print every 100th line of output. Specifically, it will print lines 100, 200, 300, etc If you use a negative argument it will print the *first* of a block, $ my_verbose_command | every -100 It will print lines 1, 101, 201, 301, etc The function wraps up this useful sed snippet: $ ... | sed -n '0~100p' don't print anything by default $ sed -n starting at line 0, then every hundred lines ( ~100 ) print. $ '0~100p' There's also some bash magic to test if the number is negative: we want character 0, length 1, of variable N. $ ${N:0:1} If it *is* negative, strip off the first character ${N:1} is character 1 onwards (second actual character).

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

Set laptop display brightness

Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

post data with a http request

count of down available ips

avoid wc overload ;)

Get absolut path to your bash-script

Another way of doing it that's a bit clearer. I'm a fan of readable code.

Get all files of particular type (say, PDF) listed on some wegpage (say, example.com)

This example command fetches 'example.com' webpage and then fetches+saves all PDF files listed (linked to) on that webpage. [*Note: of course there are no PDFs on example.com. This is just an example]

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands using echo

Commands using echo (1,545) the last day the last week the last month all time sorted by date votes

What's this?

Check These Out

Stay in the loop…

Commands using echo (1,545)

sorted by