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look for a header reference in a shared library
This is sample output - yours may be different.
0

strings libc-2.2.5.so | grep stat.h

kumara · 2009-02-05 12:41:41 1
diff directories, quick cut and paste to view the changes

We use this to quickly highlight differences and provide a quick way to cut and paste the command to view the files using the marvellous vimdiff Show Sample Output
This is sample output - yours may be different.
```
vimdiff dir1/filea dir2/filea
vimdiff dir1/fileb dir2/fileb
vimdiff dir1/filec dir2/filec
```
1

diff -q dir1/ dir2/ | grep differ | awk '{ print "vimdiff " $2 " " $4 }'

binaryslate · 2009-02-05 12:37:00 1
bulk dl files based on a pattern

-O switch creates local filename same as remote curl [][] -o #1#2 makes local files unique inserting sequence values into #x placeholders sequences can be alpha or numeric e.g [a-z] [1-25]
This is sample output - yours may be different.
4

curl -O http://hosted.met-art.com/generated_gallery/full/061606AnnaUkrainePasha/met-art-free-sample-00[00-19].jpg

kumara · 2009-02-05 12:35:07 3
list all file-types (case-insensitive extensions) including subdirectories
This is sample output - yours may be different.
-1

find /path/to/dir -type f |sed 's/^.*\///'|grep -o '\.[^.]*$'|sort -f|uniq -i

beila · 2009-02-05 12:34:44 1
while series of video and subtitles have unmatched file names, rename subtitles the same as video files.

Subtitles' file names contain S04E01, S04E02, ... S04E12 and end with ".smi". Videos' file names contain S04E01, S04E02, ... S04E12 and end with ".avi". You can change the patterns by changing `ls *S04E$jj*.smi` and `ls *S04E$jj*.avi` parts. You can change the number of starting and ending file by changing `seq -f "%02.0f" 1 12` part.
This is sample output - yours may be different.
-1

for jj in `seq -f "%02.0f" 1 12`; do rr=`ls *S04E$jj*.smi`; tt=`ls *S04E$jj*.avi`; mv "$rr" "${tt%.*}.smi"; done

beila · 2009-02-05 12:16:06 3
Replaces every ocurrences of 'old' for 'new' in all files specified

Replaces every ocurrence of 'old' for 'new' in all files specified. After the 'i' char you can put a '~' or whatever to create a backup file for each replaced with the name equal to the original plus character.
This is sample output - yours may be different.
-1

perl -i -pe "s/old/new/g" *

pandres · 2009-02-05 12:07:27 1
cycle through a 256 colour palette

just for fun
This is sample output - yours may be different.
14

yes "$(seq 232 255;seq 254 -1 233)" | while read i; do printf "\x1b[48;5;${i}m\n"; sleep .01; done

pixelbeat · 2009-02-05 12:01:37 3
Serve current directory tree at http://$HOSTNAME:8000/
This is sample output - yours may be different.
836

python -m SimpleHTTPServer

pixelbeat · 2009-02-05 11:57:43 26
Shows the largest files in your archives
This is sample output - yours may be different.
0

tar -tvjf backup.tar.bz2 | sort -nrk 3 | head

Sekenre · 2009-02-05 11:57:18 1
Remove invalid host keys from ~/.ssh/known_hosts

Useful if you have to tunnel ssh through a local port and it complains of the host key being different. Much easier than manually editing the file.
This is sample output - yours may be different.
9

ssh-keygen -R \[localhost\]:8022

Sekenre · 2009-02-05 11:48:09 1
find all processes named hunger and force kill, minus the grep itself and output to a file called fu.bar
This is sample output - yours may be different.
-4

ps -auwx|egrep hunger|grep -v grep| awk '{print "kill -9",$1}' > ~/fu.bar

lendellray · 2009-02-05 11:43:38 4
rgrep: recursive grep without .svn

Only excludes .svn from filenames. Show Sample Output
This is sample output - yours may be different.
```
[[email protected] ~/css]$ rgrep sprites
./template.php:require "css_sprites.php";
./template.php: $abs_path.'/sprites/',
./template.php: 'sprites.css',
./template.php:include 'sprites.css';
```
2

alias rgrep="find . $ ! -name .svn -o -prune $ -type f -print0 | xargs -0 grep"

nf · 2009-02-05 11:23:23 8
Get the 10 biggest files/folders for the current direcotry
This is sample output - yours may be different.
48

du -s * | sort -n | tail

bambambazooka · 2009-02-05 11:18:43 5
Start urxvt and do whatever is needed to open the screen session named "main"

Open a terminal (urxvt in this case) to connect to a screen session (named "main") and create the screen session if necessary.
This is sample output - yours may be different.
0

screen -ls | grep main && urxvt -name screen -e screen -x main || urxvt -name screen -e screen -R -S main

trey · 2009-02-05 10:51:31 1
SSH to a machine's internet address if it is not present on your local network

Ping machine once, waiting 1 second for response until failing. Upon fail, ssh globally, otherwise ssh locally.
This is sample output - yours may be different.
1

ping localip -c 1 -W 1 &> /dev/null && ssh localip || ssh globalip

trey · 2009-02-05 10:40:26 3
search the manual page names and descriptions
This is sample output - yours may be different.
2

apropos somekeyword

chrisdrew · 2009-02-05 10:29:15 3
locate bin, src, and man file for a command
This is sample output - yours may be different.
4

whereis somecommand

chrisdrew · 2009-02-05 10:29:10 1
locate a command

Returns the pathnames of the files which would be executed in the current environment had its arguments been given as a command.
This is sample output - yours may be different.
-1

which somecommand

chrisdrew · 2009-02-05 10:29:04 1
Search through files, ignoring .svn

Variant of find grep that ignores files with .svn in the name. Useful for searching through a local repository of source code.
This is sample output - yours may be different.
-3

find . -type f -print0 | grep -vzZ '.svn' | xargs -0 grep --color -nEHi "SEARCHTERM"

troelskn · 2009-02-05 10:27:15 5
cd canonical (resolve any symlinks)
This is sample output - yours may be different.
-2

alias cdc='cd `pwd -P`'

adavies42 · 2009-02-05 10:15:11 2
ring the bell
This is sample output - yours may be different.
2

alias beep='echo -en "\007"'

adavies42 · 2009-02-05 10:14:24 6
get a directory from one machine to another using tar and ssh
This is sample output - yours may be different.
2

ssh somemachine "cd some dir; tar zcpf - somedirname" |tar zxpf -

mischamolhoek · 2009-02-05 09:10:56 6
A nice command for summarising repeated information
This is sample output - yours may be different.
3

alias counts=sort | uniq -c | sort -nr

porges · 2009-02-05 08:24:02 1
Rip audio from a video file.

Replace and accordingly.
This is sample output - yours may be different.
66

mplayer -ao pcm -vo null -vc dummy -dumpaudio -dumpfile <output-file> <input-file>

sykora · 2009-02-05 08:17:04 5
diff two unsorted files without creating temporary files

bash/ksh subshell redirection (as file descriptors) used as input to diff
This is sample output - yours may be different.
96

diff <(sort file1) <(sort file2)

systemj · 2009-02-04 22:20:13 1
‹ First < 558 559 560 561 562 >

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Watch several log files in a single window

It works like a "tail -f" on several files. Use the number keys 0-9 to set a baseline in the numbered window. Pressing "b" let you scroll back in one of the windows.

Generic shell function for modifying files in-place

Some commands (such as sed and perl) have options to support in-place editing of files, but many commands do not. This shell function enables any command to change files in place. See the sample output for many examples. The function uses plain sh syntax and works with any POSIX shell or derivative, including zsh and bash.

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Recording the desktop and an application audio source for webcast

You will have to use the sound preferences (record) to choose the audio source and set it to internal.

zsh only: access a file when you don't know the path, if it is in PATH

Say you want to execute 'file' on the command 'top' (to determine what type of file it is); but you don't know where 'top' resides: preface the argument with = and zsh will implicitly prepend the path.

Sort output by column

(separator = $IFS)

Convert a flv video file to avi using mencoder

run command on a group of nodes in parallel redirecting outputs

Do the same as pssh, just in shell syntax. Put your hosts in hostlist, one per line. Command outputs are gathered in output and error directories.

Get the serial numbers from HP RAID

This dumps serial numbers of all the drives but HP warranty check does not say they are valid ...

Quick screenshot

Requires ImageMagick. Takes a screenshot 5 seconds after it's run and saves it as desktop_screenshot.jpg Particularly handy when made into a menu option or button.

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