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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 70
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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which program is this port belongs to ?

Sometimes you need to use a port that is already opened by some program , and you don't know who to "kill" for it to release - so, now you do !

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

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"

display a smiling smiley if the command succeeded and a sad smiley if the command failed

you could save the code between if and fi to a shell script named smiley.sh with the first argument as and then do a smiley.sh to see if the command succeeded. a bit needless but who cares ;)

List only directories, one per line

generate iso

find geographical location of an ip address

I save this to bin/iptrace and run "iptrace ipaddress" to get the Country, City and State of an ip address using the http://ipadress.com service. I add the following to my script to get a tinyurl of the map as well: URL=`lynx -dump http://www.ip-adress.com/ip_tracer/?QRY=$1|grep details|awk '{print $2}'` lynx -dump http://tinyurl.com/create.php?url=$URL|grep tinyurl|grep "19. http"|awk '{print $2}'

Capture video of a linux desktop

This is identical to the original command, but allows you to specify an offset if you have multiple monitors. In this case you'll record a 1366x768 window that's offset by 1366 pixels in the x axis and 0 pixels in the y axis. Note also that the -sameq option has been replaced by -qscale - at least in ffmpeg version 1.2.1 on Fedora 19.

print file without duplicated lines usind awk

show file withou duplicated lines

To have only unique lines in a file

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