All commands

All commands (14,187)

sorted by

(tcsh alias)Reverse an IPv4 address. It is useful to looking the address up in DNSBL.

For 'bash' function ip4rev() { echo $@ | sed 's/^$[0-9]*$\.$[0-9]*$\.$[0-9]*$\.$[0-9]*$/\4.\3.\2.\1/'; } Show Sample Output
This is sample output - yours may be different.
```
% ip4rev '192.0.2.34'
34.2.0.192

% dig +sh a `ip4rev 127.0.0.2`.zen.spamhaus.org.
127.0.0.2
127.0.0.4
127.0.0.10
```
-1

alias ip4rev "echo \!* | sed 's/^$[0-9]*$\.$[0-9]*$\.$[0-9]*$\.$[0-9]*$/\4.\3.\2.\1/'"

azumakuniyuki · 2009-02-09 17:00:03 10
ZSH prompt. ':)' after program execution with no error, ':(' after failure.

sorry for my english
This is sample output - yours may be different.
1

PROMPT=$'%{\e[0;32m%}%B[%b%{\e[0m%}%n%{\e[0;32m%}@%{\e[0m%}%(4c,./%1~,%~)%{\e[0;32m%}%B]%b% %(?,%{\e[0;32m%}:%)%{\e[0m%},%{\e[0;31m%}:(%{\e[0m%}) %# '

gogiel · 2009-02-09 15:34:27 12

It finds a SNMP OID too :-( Show Sample Output

alias ip4grep "grep -E '([0-9]{1,3}\.){3}[0-9]{1,3}'"

azumakuniyuki · 2009-02-09 15:08:16 11

add line number for each line
This is sample output - yours may be different.
0

cat -n file.txt

wbx · 2009-02-09 14:04:06 10
Convert HTML file into valid XML
This is sample output - yours may be different.
0

tidy -asxhtml -numeric < index.html > index.xml

zebra · 2009-02-09 11:53:26 9
Counts number of lines

Counts number of lines of code in *.h and *.cc files
This is sample output - yours may be different.
3

find . $ -name '*.h' -o -name '*.cc' $ | xargs grep . | wc -l

dgomes · 2009-02-09 11:44:35 38
archive all files containing local changes (svn)

Create a tgz archive of all the files containing local changes relative to a subversion repository. Add the '-q' option to only include files under version control: svn st -q | cut -c 8- | sed 's/^/\"/;s/$/\"/' | xargs tar -czvf ../backup.tgz Useful if you are not able to commit yet but want to create a quick backup of your work. Of course if you find yourself needing this it's probably a sign you should be using a branch, patches or distributed version control (git, mercurial, etc..)
This is sample output - yours may be different.
12

svn st | cut -c 8- | sed 's/^/\"/;s/$/\"/' | xargs tar -czvf ../backup.tgz

chrisdrew · 2009-02-09 11:24:31 15
Make syslog reread its configuration file
This is sample output - yours may be different.
-1

pkill -HUP syslogd

rimaya · 2009-02-09 09:32:06 8
Separates each frame of a animated gif file to a counted file, then appends the frames together into one sheet file. Useful for making sprite sheets for games.

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

convert +adjoin animatedImage.gif test.gif ; convert +append test*.gif

sedcommand · 2009-02-09 09:01:34 29
convert hex to decimal ; decimal to hex
This is sample output - yours may be different.
2

echo 16i `echo "F" | tr '[a-f]' '[A-F]'` p | dc ; echo 16o "15" p | dc

sedcommand · 2009-02-09 08:38:19 11
output the contents of a file removing any empty lines including lines which contain only spaces or tabs.
This is sample output - yours may be different.
2

sed -e '/^[<space><tab>]*$/d' somefile

sedcommand · 2009-02-09 08:21:37 9
print code 3-up and syntax-highlighted for easy beach-time study

This is the setup I'm using for my largest project. It gives 357 lines per page (per side), which makes it fairly easy to carry around a significant amount of code on a few sheets of paper. Try it. (I stick to the 80 column convention in my coding. For wider code, you'll have to adjust this.)
This is sample output - yours may be different.
1

enscript -E -B -3 -r -s 0 --borders -fCourier4.8 --mark-wrapped-lines=arrow

mkc · 2009-02-09 06:23:38 14
Helpful alias to grep for the PID.
This is sample output - yours may be different.
-5

alias pfind='ps aux | grep '

Oshuma · 2009-02-09 04:13:52 13
Quick aliases for going up a directory tree

Show Sample Output
This is sample output - yours may be different.
```
# Add as many levels as you need
alias :::='cd ../../../'

$ pwd
/home/you/src/some_project/tests
$ ::
$ pwd
/home/you/src
```
0

alias ::='cd ../../'

Oshuma · 2009-02-09 04:11:52 10
displays comments from random jpeg files.

depends on libjpeg-progs But how to display path to found comments? Show Sample Output
This is sample output - yours may be different.
```
CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 95
```
0

find ~/random_jpegs/folder -name "*.jpg" -exec rdjpgcom {} \;

Williebee · 2009-02-09 02:58:13 14
show physical disk using

show physical disk using, except tmpfs, gvfs, and so on.
This is sample output - yours may be different.
-1

df -x tmpfs | grep -vE "(gvfs|procbususb|rootfs)"

bones7456 · 2009-02-09 01:54:05 12
Split and join with split and cat.

`split -b 1k file` splits files into 1k chunks. Rejoin them with `cat x* > file`.
This is sample output - yours may be different.
2

split -b 1k file ; cat x* > file

abcde · 2009-02-08 23:10:18 10
seq can produce the same thing as Perl's ... operator.

Optionally, one can use {1..50} instead of seq. E.g. for i in {1..50} ; do echo Iteration $i ; done Show Sample Output
This is sample output - yours may be different.
```
Iteration 1
Iteration 2
Iteration 3
Iteration 4
Iteration 5
etc..
```
8

for i in $(seq 1 50) ; do echo Iteration $i ; done

abcde · 2009-02-08 23:03:31 13
List only the directories

This command would be useful when it is desirable to list only the directories. 'egrep' chooses only the lines that begin with 'd'. Show Sample Output
This is sample output - yours may be different.
```
$ ls -l 
drwxrwx--- 2 sim sim 4096 2009-02-08 14:19 adir
-rwxrwx--- 1 sim sim   52 2009-02-05 13:11 a.sh
-rw-rw---- 1 sim sim    0 2009-02-05 13:09 x.txt
-rw-rw---- 1 sim sim    0 2009-02-05 13:09 y.txt
-rw-rw---- 1 sim sim    0 2009-02-05 13:09 z.txt

$ ls -l | egrep ^d
drwxrwx--- 2 sim sim 4096 2009-02-08 14:19 adir
```
3

ls -l | egrep ^d

ergut · 2009-02-08 22:21:55 13
ssh tunnel with auto reconnect ability
This is sample output - yours may be different.
13

while [ ! -f /tmp/stop ]; do ssh -o ExitOnForwardFailure=yes -R 2222:localhost:22 target "while nc -zv localhost 2222; do sleep 5; done"; sleep 5;done

jianingy · 2009-02-08 12:45:43 18
find the difference between two nodes
This is sample output - yours may be different.
6

diff <(ssh nx915000 "rpm -qa") <(ssh nx915001 "rpm -qa")

jianingy · 2009-02-08 12:41:25 11
run command on a group of nodes in parallel
This is sample output - yours may be different.
1

echo -n m{1..5}.cluster.net | xargs -d' ' -n1 -P5 -I{} ssh {} 'uptime'

jianingy · 2009-02-08 12:34:04 15
Extract tarball from internet without local saving
This is sample output - yours may be different.
73

wget -qO - "http://www.tarball.com/tarball.gz" | tar zxvf -

jianingy · 2009-02-08 12:22:54 29
hello, world

quoted from http://0-9.sakura.ne.jp/blog/archives/2008/10/29121116.html
This is sample output - yours may be different.
0

perl -e "''=~('(?{'.('-^@.]|(;,@/{}/),[\\\$['^'],)@)[\`^@,@[*@[@?}.|').'})')"

wbx · 2009-02-08 10:42:02 14
output your microphone to a remote computer's speaker

This will output the sound from your microphone port to the ssh target computer's speaker port. The sound quality is very bad, so you will hear a lot of hissing.
This is sample output - yours may be different.
228

dd if=/dev/dsp | ssh -c arcfour -C username@host dd of=/dev/dsp

morpheus · 2009-02-08 10:10:00 110
‹ First < 553 554 555 556 557 > 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

Read random news on the internet

Access a random news web page on the internet. The Links browser can of course be replaced by Firefox or any modern graphical web browser.

Convert all WMF images to SVG recursively ignoring file extension case

This assumes you have the package installed necessary for converting WMF files. On my Ubuntu box, this is libwmf-bin. I used this command, as libwmf is not on my wife's iMac, so I archived the directories containing the WMF files from OS X, ran them on my Ubuntu box, archived the resulting SVGs, and sent them back to her. Quick, simple and to the point. Searches directories recursively looking for extensions ignoring case. This is much more readable and clean than -exec for find. The while loop also gives further flexibility on complex logic. Also, although there is 'wmf2svg --auto', it expects lowercase extensions, and not uppercase. Because I want to ignore case, I need to use the -o option instead. Works in ZSH and BASH. Haven't tested in other shells.

Convert your favorite image in xpm for using in grub

* size must be 640?480 pixels * only has 14 colors * save it in XPM format Edit /boot/grub/menu.lst and add splashimage=(hd0,0)/boot/grub/grubimg.xpm make sure for your path name and hard disk

Randomize lines in a file

Works in sort (GNU coreutils) 7.4, don't know when it was implemented but sometime the last 6 years.

Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

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"

list block devices

Shows all block devices in a tree with descruptions of what they are.

Maximum PNG compression with optipng, advpng, and advdef

optipng and advancecomp (for the the advpng and advdef tools) are the best FOSS tools for losslessly compressing PNGs. With the above tool chain, you can cut off as much as 20% off a PNG's file size.

Mirror the NASA Astronomy Picture of the Day Archive

Mirror the entire NASA Astronomy Picture of the Day archive, all the way from 1995. The archive is close to 2.5 GB, with lots of files, so give it some time. The logs can be redirected to a file using '-o somefile'. You might also want to try '-nH' and the '--cut-dirs' options

Hits per hour apache log

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)

All commands (14,187) 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…

All commands (14,187)

sorted by