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Convert all tabs in a file to spaces, assuming the tab width is 2
This is sample output - yours may be different.
-2

sed -i 's/\t/ /g' yourfile

chmduquesne · 2010-03-24 18:04:28 4
Change prompt to MS-DOS one (joke)

Show Sample Output
This is sample output - yours may be different.
```
C:\usr\share\man\> 
```
16

export PS1="C:\$( pwd | sed 's:/:\\\\\\:g' )\\> "

stick · 2010-03-24 16:21:32 69
AIX : reset aixuser password lastupdate to now using perl
This is sample output - yours may be different.
0

perl -e '$now=time; system "chsec -f /etc/security/passwd -s aixuser -a \"lastupdate=$now\""'

snaguber · 2010-03-24 12:54:29 3
Skip banner on ssh login prompt

This allows you to skip the banner (usually /etc/issue.net) on ssh connections. Useful to avoid banners outputted to your mail by rsync cronjobs.
This is sample output - yours may be different.
1

ssh -q user@server

KoRoVaMiLK · 2010-03-24 12:02:55 4

Validates and pretty-prints the content fetched from the URL. Show Sample Output

This is sample output - yours may be different.

[
    {
        "d": "22 Useful Online Chart & Graph Generators | Tools", 
        "dt": "2010-03-24T00:00:00Z", 
        "t": [
            "charts", 
            "tools", 
            "chart", 
            "generator", 
            "graph", 
            "online", 
            "graphs", 
            "web", 
            "design", 
            "webdesign"
        ], 
        "u": "http://www.hongkiat.com/blog/22-useful-chart-graph-diagram-generators/"
    }, 
    {
        "d": "Official Google Data APIs Blog: Bringing OpenID and OAuth Together", 
        "dt": "2010-03-24T00:00:00Z", 
        "t": [
            "openid", 
            "oauth", 
            "google", 
            "identity", 
            "security", 
            "authentication", 
            "api", 
            "plaxo", 
            "protocol", 
            "data"
        ], 
        "u": "http://googledataapis.blogspot.com/2009/01/bringing-openid-and-oauth-together.html"
    }, 
    {
        "d": "Great Girl Manipulations by Digital Artist Michael O. | Abduzeedo - design inspiration and tutorials", 
        "dt": "2010-03-24T00:00:00Z", 
        "t": [
            "photoshop", 
            "art", 
            "photography", 
            "inspiration", 
            "design", 
            "photos", 
            "women", 
            "blog", 
            "awesome", 
            "cool"
        ], 
        "u": "http://abduzeedo.com/great-girl-manipulations-digital-artist-michael-o"
    }, 
    {
        "d": "Nightline Face-Off - ABC News", 
        "dt": "2010-03-24T00:00:00Z", 
        "t": [
            "debate", 
            "satan", 
            "theology", 
            "video", 
            "driscoll", 
            "news", 
            "education", 
            "religion", 
            "faceoff", 
            "television"
        ], 
        "u": "http://www.abcnews.go.com/Nightline/FaceOff/"
    }, 
    {
        "d": "How Twitter and Facebook Make Us More Productive | Magazine", 
        "dt": "2010-03-24T00:00:00Z", 
        "t": [
            "twitter", 
            "facebook", 
            "productivity", 
            "socialmedia", 
            "creativity", 
            "wired", 
            "research", 
            "social", 
            "socialnetworking", 
            "work"
        ], 
        "u": "http://www.wired.com/magazine/2010/02/st_essay_distraction/"
    }
]

curl -s "http://feeds.delicious.com/v2/json?count=5" | python -m json.tool | less -R

keimlink · 2010-03-24 09:15:12 21

Print your local hostname with python

Show Sample Output
This is sample output - yours may be different.
```
brian.intranet.example.com
```
-3

python -c "import platform; print platform.node()"

keimlink · 2010-03-24 09:09:34 5
Update zone file Serial numbers

Will edit *.db files in the same directory with todays date. Useful for doing a mass update to domains on a nameserver, adding spf records, etc. Looks for a string starting with 200 or 201 followed by 7 numbers, and replaces with todays date. This won't overwrite Ip's but i would still do some double checking after running this. Make sure your server's date is correct, otherwise insert your own serial number. rndc reload should usually follow this command.
This is sample output - yours may be different.
7

sed -i 's/20[0-1][0-9]\{7\}/'`date +%Y%m%d%I`'/g' *.db

alf · 2010-03-24 07:28:58 10
Recover remote tar backup with ssh

Here how to recover the remote backup over ssh Show Sample Output
This is sample output - yours may be different.
```
[nothing]
```
8

ssh user@host "cat /path/to/backup/backupfile.tar.bz2" |tar jpxf -

mack · 2010-03-24 01:35:28 7
Remote backups with tar over ssh

Execute it from the source host, where the source files you wish backup resides. With the minus '-' the tar command deliver the compressed output to the standar output and, trough over the ssh session to the remote host. On the other hand the backup host will be receive the stream and read it from the standar input sending it to the /path/to/backup/backupfile.tar.bz2 Show Sample Output
This is sample output - yours may be different.
```
[nothing]
```
13

tar jcpf - [sourceDirs] |ssh user@host "cat > /path/to/backup/backupfile.tar.bz2"

mack · 2010-03-24 01:29:25 7
Recursively scan directories for mp3s and pass them to mplayer

The command first deletes any old playlist calles playlist.tmp under /tmp. After that it recursively searches all direcotries under ~/mp3 and stores the result in /tmp/playlist.tmp. After havin created the playlist, the command will execute mplayer which will shuffle through the playlist. This command is aliased to m is aliased to `rm -rf /tmp/playlist.tmp && find ~/mp3 -name *.mp3 > /tmp/playlist.tmp && mplayer -playlist /tmp/playlist.tmp -shuffle -loop 0 | grep Playing' in my ~/.bashrc. Show Sample Output
This is sample output - yours may be different.
```
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Playing /home/hhanff/mp3/Alben/Sunrise Ave/On the way to wonderland/01-Choose to Be Me.mp3.
```
2

rm -rf /tmp/playlist.tmp && find ~/mp3 -name *.mp3 > /tmp/playlist.tmp && mplayer -playlist /tmp/playlist.tmp -shuffle -loop 0 | grep Playing

hhanff · 2010-03-23 21:33:44 15
the executable that started the currently running oracle databases and the ORACLE_HOME relative to each

get a list of currently running oracle dbs (identified by the pmon process) show the executable that spawned the process and show the ORACLE_HOME relative to the environment within which the process is running tailored to AIX (sed on linux behaves...differently) suggestions for a better way...please.
This is sample output - yours may be different.
1

ps -ef |grep oracle |grep pmon |awk '{print $2}' |xargs -I {} ps eww {} |grep pmon |grep -v grep |awk '{print $5 " " $6 " " $0}' |sed 's/$S*$ $S*$ .*ORACLE_HOME/\1 \2/g' |cut -f1,2,3 -d" "

brianmuckian · 2010-03-23 20:36:59 5
Recursively remove all empty directories
This is sample output - yours may be different.
49

find . -type d -empty -delete

jmcantrell · 2010-03-23 15:21:33 20
Count threads of a jvm process

if you have problem threads problem in tomcat
This is sample output - yours may be different.
1

ps uH p <PID_OF_U_PROCESS> | wc -l

mrbyte · 2010-03-23 15:05:27 5
Restore mysql database uncompressing on the fly.

This way you keep the file compressed saving disk space. Other way less optimal using named pipes: mysql -uroot -p'passwd' database <
This is sample output - yours may be different.
5

zcat database.sql.gz | mysql -uroot -p'passwd' database

rubenmoran · 2010-03-23 12:41:57 7
Number of files in a SVN Repository

This command will output the total number of files in a SVN Repository. Show Sample Output
This is sample output - yours may be different.
```
1250
```
3

svn log -v --xml file:///path/to/rep | grep kind=\"file\"|wc -l

andremta · 2010-03-23 12:16:06 7
Recursively remove all empty directories
This is sample output - yours may be different.
-3

find . -depth -type d -empty -exec rmdir -v {} \;

ZungBang · 2010-03-23 12:15:58 5
Count repeated lines, listing them in descending order of frequency

Finds all (not just adjacent) repeated lines in a file. Show Sample Output
This is sample output - yours may be different.
```
      6 G
      6 E
      6 C
      6 A
      4 F
      4 D
      4 B
      4 0.5
      4 0.1
      2 1
      2 0.9
      2 0.7
      2 0.4
      2 0.2
```
0

LC_ALL=C sort file | uniq -c | sort -n -k1 -r

drmaciver · 2010-03-23 12:09:04 3
Recursively remove all empty directories

Remove all empty directories below the current directory. If directories become empty as the results of this, remove those too.
This is sample output - yours may be different.
-2

find . -type d | tac | xargs rmdir 2> /dev/null

drmaciver · 2010-03-23 11:54:38 6
Use ping to test if a server is up

Bash scrip to test if a server is up, you can use this before wget'ing a file to make sure a blank one isn't downloaded.
This is sample output - yours may be different.
-1

if [ "$(ping -q -c1 google.com)" ];then wget -mnd -q http://www.google.com/intl/en_ALL/images/logo.gif ;fi

alf · 2010-03-23 04:15:03 10
Currency Conversion

This works in Mac OS X (10.6.2) (natively comes with curl) usage: currency_convert $1(amount) $2(from_denomination) $3(to_denomination) Show Sample Output
This is sample output - yours may be different.
```
3 USD = 11.0181 AED
```
1

currency_convert() { curl -s "http://www.google.com/finance/converter?a=$1&from=$2&to=$3" | sed '/res/!d;s/<[^>]*>//g'; }

IsraelTorres · 2010-03-23 04:13:12 23
show last revision log on svn update
This is sample output - yours may be different.
0

svn up | sed 's/\.//g' | cut -d ' ' -f3 | xargs svn log -r

zougi · 2010-03-22 21:48:32 4
Kill process you don't know the PID of, when pidof and pgrep are not available.

This will kill a specific process you don't know the PID of, when pidof and pgrep are not available, for example on OS X. var1 is created so that the whitespace can be trimmed before passing off to kill. Show Sample Output
This is sample output - yours may be different.
```
n/a
```
-5

export var1=`ps -A | grep '[u]nique' | cut -d '?' -f 1`; echo${var1/ /}; kill -9 $var1

headyadmin · 2010-03-22 21:06:58 5
Currency Conversion

eg: currency_convert 1 usd inr Show Sample Output
This is sample output - yours may be different.
```
1 USD = 45.4950 INR
```
3

currency_convert() { wget -qO- "http://www.google.com/finance/converter?a=$1&from=$2&to=$3&hl=es" | sed '/res/!d;s/<[^>]*>//g'; }

vinodvm · 2010-03-22 13:41:39 282
Search pattern case insensitive
This is sample output - yours may be different.
0

:/\c{pattern}

yohananov · 2010-03-22 11:23:08 3
nautilus
This is sample output - yours may be different.
-16

nohup nautilus &

lishuai860113 · 2010-03-22 10:39:44 177
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Last month

Work out last months value

ubuntu tasksel

The command tasksel allows the choice of packages from the command line to get predefined configurations for specific services (usually this option is offered during installation).

How to remove an ISO image from media database

Update dyndns.org with your external IP.

This is great if you are behind a router that does not support dynamic dns updates! Example: AT&T u-verse gateway... Put this in a script and run it as a cron job.

Find usb device in realtime

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

Use lynx to run repeating website actions

This command will tell lynx to read keystrokes from the specified file - which can be used in a cronjob to auto-login on websites that give you points for logging in once a day *cough cough* (which is why I used -accept_all_cookies). For creating your keystroke file, use: $ lynx -cmd_log yourfile

Fast file backup

This is a BASH feature. The above command will create a backup of "filename" called "filename.DATE", where DATE is the actual day in %Y%m%d (year, month and day numbers together) format.

Backup a file with a date-time stamp

Appends the input file with the date format YYYY-MM-DD.bak. Also runs silently if you remove the -v on the cp at the end of the function.

statistics in one line

In this example, file contains five columns where first column is text. Variance is calculated for columns 2 - 5 by using perl module Statistics::Descriptive. There are many more statistical functions available in the module.

unbuffered python output

You have a python script that slowly prints output, you want to pipe the output to grep or tee, and you are impatient and want to watch the results right away. Rather than modify your script (making it slightly less efficient), use the -u option to have the output unbuffered.

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