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Copy 3 files from 3 different servers and adds server name tag to file copied
This is sample output - yours may be different.
1

for i in `seq 1 3`; do scp finku@server$i:file.txt server$i-file.txt; done

finku · 2009-07-10 17:10:55 2
SSH monitor
This is sample output - yours may be different.
0

ssh root@server 'tail --max-unchanged-stats=10 -n0 -F /var/log/auth.log ' | grep Accepted | while read l ; do kdialog --title "SSH monitor" --passivepopup "$l" 3; done

skygreg · 2009-07-10 14:25:35 13
Printing multiple years with Unix cal command

print multiple increasing years using cal - calendar -. You can also try seq Start Increment End
This is sample output - yours may be different.
3

for y in $(seq 2009 2011); do cal $y; done

JesusSuperstar · 2009-07-10 10:07:46 26
Printing multiple years with Unix cal command

src: http://tinyapps.org/weblog/nix/200907090700_linux_cal_print_multiple_years.html
This is sample output - yours may be different.
1

for y in 2009 2010 2011; do cal $y; done

miccaman · 2009-07-10 09:06:01 26
Matrix Style

It's the same command as submitted, but first with a command to make all characters green. It's the only way it looked "matrix-like" on my gnome-terminal.
This is sample output - yours may be different.
2

echo -e "\e[31m"; while $t; do for i in `seq 1 30`;do r="$[($RANDOM % 2)]";h="$[($RANDOM % 4)]";if [ $h -eq 1 ]; then v="\e[1m $r";else v="\e[2m $r";fi;v2="$v2 $v";done;echo -e $v2;v2="";done;

Patola · 2009-07-10 04:20:43 6
Matrix Style

Another wall matrix :) Show Sample Output
This is sample output - yours may be different.
```
You can decrease/increase the bright numbers modifying the $h variable  , a higher number less brightness
```
1

while $t; do for i in `seq 1 30`;do r="$[($RANDOM % 2)]";h="$[($RANDOM % 4)]";if [ $h -eq 1 ]; then v="\e[1m $r";else v="\e[2m $r";fi;v2="$v2 $v";done;echo -e $v2;v2="";done;

jhansen · 2009-07-10 00:54:21 6
Migrate gems from one ruby installation to another

gemInst.sh: #!/bin/bash for i in $@; do if [ "$1" != "$i" ] then echo /newInstall/gem install $1 -v=\"$i\" /newInstall/gem install $1 -v="$i" if [ "$?" != "0" ] then echo -e "\n\nGEM INSTALL ERROR: $1\n\n" echo "$1" > gemInst.err fi fi done
This is sample output - yours may be different.
0

/originalInstall/gem list | tr -d '(),' | xargs -L 1 sudo ./gemInst.sh

snakerdlk · 2009-07-09 21:46:06 4
IFS - use entire lines in your for cycles

When you use a "for" construct, it cycles on every word. If you want to cycle on a line-by-line basis (and, well, you can't use xargs -n1 :D), you can set the IFS variable to . Show Sample Output
This is sample output - yours may be different.
```
$ cat file
line one
line two
$ for i in `cat file`; do echo $i; done
line
one
line
two
$ export IFS=$(echo -e "\n")
$ for i in `cat file`; do echo $i; done
line one
line two
```
8

export IFS=$(echo -e "\n")

darkpand · 2009-07-09 15:25:37 9
Move large numbers of files

In my job I often have to deal with moving 100,000 files or more. A mv won't do it because there are too many. This will move everything in the current directory to the target path.
This is sample output - yours may be different.
-5

for f in *; do mv $f <target_path>; done;

fritz_monroe · 2009-07-09 12:07:49 10
Scan computers OS and open services on all network
This is sample output - yours may be different.
0

nmap -O 192.168.1.1/24

xptonix · 2009-07-09 10:57:51 4
ignore hidden directory in bash completion (e.g. .svn)

add it in ~/.bashrc install bash-completion
This is sample output - yours may be different.
4

bind 'set match-hidden-files off'

freestyler · 2009-07-09 10:05:13 6
let w3m usecookie
This is sample output - yours may be different.
-4

alias w3m='w3m -cookie'

freestyler · 2009-07-09 09:01:55 4
extract all tgz in current dir
This is sample output - yours may be different.
0

ls *tgz | xargs -n1 tar xzf

freestyler · 2009-07-09 08:54:06 5
bbs in utf8 console
This is sample output - yours may be different.
0

luit -encoding gbk telnet bbs.sysu.edu.cn

freestyler · 2009-07-09 08:51:21 4
Uninstall all MacPorts that are no longer active
This is sample output - yours may be different.
-1

sudo port installed | grep -v 'active\|The' | xargs sudo port uninstall

letterj · 2009-07-09 05:15:30 6

html2text: http://www.mbayer.de/html2text/ Show Sample Output

curl -sd q=Network http://www.commandlinefu.com/search/autocomplete |html2text -width 100

commandlinefu · 2009-07-09 00:57:28 10

Compare a remote file with a local file
This is sample output - yours may be different.
9

vimdiff <file> scp://[<user>@]<host>/<file>

Tekhne · 2009-07-08 22:40:25 10
Compare a remote file with a local file

A little messy, but functional. Requires vim >= 7.x.
This is sample output - yours may be different.
1

vimdiff scp://[user@]host1/<file> scp://[user@]host2/<file>

Tekhne · 2009-07-08 22:39:36 8
Attempt an XSS exploit on commandlinefu.com

Mouse around the title of this item, and note that your cookies are being logged to the console. If I were evil, I could instead send everyone's cookies to my site, and then post up-votes on all my submissions using their cookies, and try to delete every other submission, until clfu was completely pwned by me, redirecting people to malware and porn sites, and so on. Update - now fixed.
This is sample output - yours may be different.
5

perl -pi -e 's/<a href="#" onmouseover="console.log('xss! '+document.cookie)" style="position:absolute;height:0;width:0;background:transparent;font-weight:normal;">xss</a>/<\/a>/g'

isaacs · 2009-07-08 22:26:15 30
Move files around local filesystem with tar without wasting space using an intermediate tarball.
This is sample output - yours may be different.
-3

tar -C <source_dir> -cf . | tar -C <dest_dir> -xf -

Tekhne · 2009-07-08 22:20:45 5
Move files around local filesystem with tar without wasting space using an intermediate tarball.
This is sample output - yours may be different.
-4

tar -C <source_dir> -cf . | tar -C <dest_dir> -xf

Tekhne · 2009-07-08 22:19:04 6
Alternative size (human readable) of files and directories (biggest last)
This is sample output - yours may be different.
2

du -ms * | sort -nk1

Tekhne · 2009-07-08 22:11:50 25
Search commandlinefu from the command line

There's probably a more efficient way to do this rather than the relatively long perl program, but perl is my hammer, so text processing looks like a nail. This is of course a lot to type all at once. You can make it better by putting this somewhere: clf () { (curl -d "q=$@" http://www.commandlinefu.com/search/autocomplete 2>/dev/null) | egrep 'autocomplete|votes|destination' | perl -pi -e 's/<a style="display:none" class="destination" href="//g;s/<[^>]*>//g;s/">$/\n\n/g;s/^ +|\([0-9]+ votes,//g;s/^\//http:\/\/commandlinefu.com\//g'; } Then, to look up any command, you can do this: clf diff This is similar to http://www.colivre.coop.br/Aurium/CLFUSearch except that it's just one line, so more in the spirit of CLF, in my opinion. Show Sample Output
This is sample output - yours may be different.
```
grep --color=auto -iRnH "$search_word" $directory

Grep for word in directory (recursive)                 
http://commandlinefu.com/commands/view/1144/grep-for-word-in-directory-recursive


grep -i --color=auto

Grep colorized                 
http://commandlinefu.com/commands/view/2004/grep-colorized
```
1

(curl -d q=grep http://www.commandlinefu.com/search/autocomplete) | egrep 'autocomplete|votes|destination' | perl -pi -e 's/a style="display:none" class="destination" href="//g;s/<[^>]*>//g;s/">$/\n\n/g;s/^ +//g;s/^\//http:\/\/commandlinefu.com\//g'

isaacs · 2009-07-08 22:10:49 13
find a word in multiple files avoiding svn

this command searches for a keyword or an expression in a path and avoids versionned files
This is sample output - yours may be different.
-2

grep -r 'keyword keyword2' your/path/ | grep -v svn

anis · 2009-07-08 20:48:11 6
List all files in current directory by size
This is sample output - yours may be different.
-3

du -sh *

erlebnishengst · 2009-07-08 20:11:13 6
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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.

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Print with tabular

Find the package that installed a command

encode a text to url_encoded format

usefull for posts via wget

Bruteforce dm-crypt using shell expansion

Lost your luks passphrase? You can always bruteforce from the command line. See the sample output, a simple command for the "pass" word, using combinations of upper/lowercase or number replacement. The generated combinations are: for a in {p,P}{a,A,4}{s,S,5}{s,S,5}; do echo $a; done pass pasS pas5 paSs paSS paS5 ...

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"

backup delicious bookmarks

Useful script to backup all your delicious bookmarks. With decilicious shutting down soon , it could be useful

Count threads of a jvm process

if you have problem threads problem in tomcat

Read and write to TCP or UDP sockets with common bash tools

Ever needed to test firewalls but didn't have netcat, telnet or even FTP? Enter /dev/tcp, your new best friend. /dev/tcp/(hostname)/(port) is a bash builtin that bash can use to open connections to TCP and UDP ports. This one-liner opens a connection on a port to a server and lets you read and write to it from the terminal. How it works: First, exec sets up a redirect for /dev/tcp/$server/$port to file descriptor 5. Then, as per some excellent feedback from @flatcap, we launch a redirect from file descriptor 5 to STDOUT and send that to the background (which is what causes the PID to be printed when the commands are run), and then redirect STDIN to file descriptor 5 with the second cat. Finally, when the second cat dies (the connection is closed), we clean up the file descriptor with 'exec 5>&-'. It can be used to test FTP, HTTP, NTP, or can connect to netcat listening on a port (makes for a simple chat client!) Replace /tcp/ with /udp/ to use UDP instead.

Display text as though it is being typed out in real time

Pipe Viewer allows you to monitor the progress of a data transfer or command, or to show the time elapsed, among other things. In this use, it limits the transfer rate of the echo command to 10 bytes per second, making your text appear to be typed out in real time as in Hollywood movies. Fun!

Create a new file

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