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Fast searh Ubntu software repo
This is sample output - yours may be different.
-2

alias acs='apt-cache search'

hide1713 · 2009-02-07 22:08:44 11
wget ? server to server files transfer

wget ? server to server files transfer
This is sample output - yours may be different.
-2

wget -H -r ?level=1 -k -p http://www.domain.com/folder/

svnlabs · 2009-12-27 05:23:27 3
Get KDE version

kded --version return this Qt: 3.3.8b KDE: 3.5.10 KDE Daemon: $Id: kded.cpp 711061 2007-09-11 09:42:51Z tpatzig $ awk -F: ................. Awk Field separator NR == 2 ................. Register Number, second line {print $2} ............... second field sed 's/\s\+//g' .......... remove one space or more \s\+ changing by nothing Show Sample Output
This is sample output - yours may be different.
```
3.5.10
```
-2

kded --version | awk -F: 'NR == 2 {print $2}' | sed 's/\s\+//g'

voyeg3r · 2012-01-17 17:44:23 5
List ReverseSSH ports

gets network ports only ones for the sshd service only logged in a specific user (changed for public posting) only in a specific localhost:port range not IPv6 Only the part of the response after the ":" character Only the part of the response before the 1st space Output is just the rssh port
This is sample output - yours may be different.
-2

sudo lsof -i -n | grep sshd | grep sshuser | grep :[PORT-RANGE] | grep -v IPv6 | awk -F\: '{print $2}' | grep -v http | awk -F" " '{print $1}'

das_shark · 2015-04-09 15:41:11 24
MAC OS X: audible notification after a long command

I often run some command that takes a while to finish. By putting the say command afterward, I get an audio notification. Please note that this command (say) only works on Mac OS X and not Linux.
This is sample output - yours may be different.
-2

long_command; say I am all done

haivu · 2010-01-27 19:03:01 12
Individually compress each file in a directory

Compresses each file individually, creating a $fileneame.tar.gz and removes the uncompressed version, usefull if you have lots of files and don't want 1 huge archive containing them all. you could replace ls with ls *.pdf to just perform the action on pdfs for example.
This is sample output - yours may be different.
-2

ls | while read filename; do tar -czvf "$filename".tar.gz "$filename"; rm "$filename"; done

Thingymebob · 2010-03-29 08:10:38 8

Create & mount 'encrypted filesystem' on a partition or file

In order to create a new encrypted filing system managed by cryptmount, you can use the supplied 'cryptmount-setup' program, which can be used by the superuser to interactively configure a basic setup. Alternatively, suppose that we wish to setup a new encrypted filing system, that will have a target-name of "opaque". If we have a free disk partition available, say /dev/hdb63, then we can use this directly to store the encrypted filing system. Alternatively, if we want to store the encrypted filing system within an ordinary file, we need to create space using a recipe such as: dd if=/dev/zero of=/home/opaque.fs bs=1M count=512 . cryptmount --generate-key 32 opaque . cryptmount --prepare opaque . mke2fs /dev/mapper/opaque . cryptmount --release opaque . mkdir /home/crypt . cryptmount -m opaque . cryptmount -u opaque For detail see sample output Show Sample Output

This is sample output - yours may be different.

In order to create a new encrypted filing system managed by cryptmount,
       you can use the supplied 'cryptmount-setup' program, which can be  used
       by the superuser to interactively configure a basic setup.

       Alternatively,  suppose  that  we  wish to setup a new encrypted filing
       system, that will have a target-name of "opaque".  If we  have  a  free
       disk partition available, say /dev/hdb63, then we can use this directly
       to store the encrypted filing system.  Alternatively,  if  we  want  to
       store  the  encrypted filing system within an ordinary file, we need to
       create space using a recipe such as:

$dd if=/dev/zero of=/home/opaque.fs bs=1M count=512

       and then replace all occurences of '/dev/hdb63' in the  following  with
       '/home/opaque.fs'.   (/dev/urandom  can  be used in place of /dev/zero,
       debatably for extra security, but is rather slower.)

       First,  we  need  to  add  an  entry  in  /etc/cryptmount/cmtab,  which
       describes  the  encryption  that will be used to protect the filesystem
       itself and the access key, as follows:

           opaque {
               dev=/dev/hdb63 dir=/home/crypt
               fstype=ext2 mountoptions=defaults cipher=twofish
               keyfile=/etc/cryptmount/opaque.key
               keyformat=builtin
           }

       Here, we will be using the "twofish" algorithm to  encrypt  the  filing
       system  itself, with the built-in key-manager being used to protect the
       decryption key (to be stored in /etc/cryptmount/opaque.key).

       In  order  to  generate  a  secret  decryption  key   (in   /etc/crypt&#8208;
       mount/opaque.key)  that  will  be  used  to  encrypt  the filing system
itself, we can execute, as root:

$cryptmount --generate-key 32 opaque

       This will generate a 32-byte (256-bit) key, which is known to  be  sup&#8208;
       ported  by the Twofish cipher algorithm, and store it in encrypted form
       after asking the system administrator for a password.

       If we now execute, as root:

$cryptmount --prepare opaque

       we will then be asked for the password that we  used  when  setting  up
       /etc/cryptmount/opaque.key,  which  will  enable  cryptmount to setup a
       device-mapper target (/dev/mapper/opaque).  (If you  receive  an  error
       message  of the form device-mapper ioctl cmd 9 failed: Invalid argument
       , this may mean that you have chosen a key-size that isn't supported by
       your chosen cipher algorithm.  You can get some information about suit&#8208;
       able key-sizes by checking the output  from  "more  /proc/crypto",  and
       looking at the "min keysize" and "max keysize" fields.)

       We  can  now  use  standard tools to create the actual filing system on
       /dev/mapper/opaque:

$mke2fs /dev/mapper/opaque

       (It may be advisable, after the filesystem is first mounted,  to  check
       that  the  permissions of the top-level directory created by mke2fs are
       appropriate for your needs.)

       After executing

$cryptmount --release opaque
$mkdir /home/crypt

       the encrypted filing system is ready for use.  Ordinary users can mount
       it by typing

$cryptmount -m opaque

       or

           cryptmount opaque

       and unmount it using

$cryptmount -u opaque

-2

cryptmount -m <name>

totti · 2012-01-17 18:02:47 8

disable touchpad
This is sample output - yours may be different.
-2

synclient TouchPadOff=1

eastwind · 2013-04-02 23:28:36 4
Get number of established sessions on a given port

This counts all established sessions on port 80. You can change :80 to any port number you want to check. Show Sample Output
This is sample output - yours may be different.
```
20
```
-2

netstat -anp | grep :80 | grep ESTABLISHED | wc -l

krizzo · 2015-04-10 19:32:31 12
List by size all of the directories in a given tree.

This command lists all the directories in SEARCHPATH by size, displaying their size in a human readable format. Show Sample Output
This is sample output - yours may be different.
```
257M    /var/
147M    /var/cache
144M    /var/cache/apt
110M    /var/cache/apt/archives
96M     /var/lib
67M     /var/lib/apt
66M     /var/lib/apt/lists
22M     /var/lib/dpkg
20M     /var/lib/dpkg/info
15M     /var/log
```
-2

SEARCHPATH=/var/; find $SEARCHPATH -type d -print0 | xargs -0 du -s 2> /dev/null | sort -nr | sed 's|^.*'$SEARCHPATH'|'$SEARCHPATH'|' | xargs du -sh 2> /dev/null

moogmusic · 2011-07-06 08:21:58 4
enable touchpad
This is sample output - yours may be different.
-2

synclient TouchPadOff=0

eastwind · 2013-04-02 23:29:03 6
strip ^M character from files in VI

Files saved on a windows machine use different ascii characters for lines turns. When viewing such files in VI the will most often have a ^M(control-VM) character at the end of each line. This command will remove all occurrences of that character
This is sample output - yours may be different.
-2

:%s/<control-VM>//g

roliver · 2009-02-17 01:23:39 8
Backup a file before editing it.

Emacs backs up previous versions by default.
This is sample output - yours may be different.
-2

man emacs

cwimmer · 2011-08-17 00:37:00 3
get a random number in bash

use it to stagger cronjob or to get a random number increase the range by replacing 100 with your own max value Show Sample Output
This is sample output - yours may be different.
```
bash-4.1$ echo $[RANDOM % 100]
89
```
-2

echo $[RANDOM % 100] # range 0-99

anapsix · 2013-05-25 19:02:00 9
oneliner to open several times same application

just replace the number 5 with the variable you want , and the xpenguins software with the one you want Show Sample Output
This is sample output - yours may be different.
```
gnu@robby:~$ i="0";  while [ $i  -lt  5 ]  ;  do xpenguins &  i=$[$i+1] ; done   
[10] 29014
[11] 29015
[12] 29016
[13] 29017
[14] 29018
gnu@robby:~$
```
-2

i="0"; while [ $i -lt 5 ] ; do xpenguins & i=$[$i+1] ; done

eastwind · 2009-12-27 21:05:33 3
Generate MD5 of string and output only the hash checksum

Nothing special about hashing here, only the use of cut, I think, could result at fewer keystrokes. Show Sample Output
This is sample output - yours may be different.
```
23e4a2a9d1c125733a2e6b797f7f54ef
```
-2

echo -n "String to MD5" | md5sum | cut -f1 -d' '

xakon · 2011-03-05 03:53:09 4
grep files by date and delete

executed on SLES 11.2
This is sample output - yours may be different.
-2

ls -ltr |grep 'May 12'|awk '{print $9;}'|xargs rm -v

harpo · 2012-06-04 12:31:41 3
List your FLAC albums

Run this in your music folder, or give the path directly after "find". The sed pattern filters away the basename. Show Sample Output
This is sample output - yours may be different.
```
./La Perdita Generacio/(2008-09-06) Eksplodigos vian domon
./Cirkus Miramar/Fisk och skaldjur i svenska vatten
./fsFreak/(2007-06-24) The Lost Love Sessions
./Sigur R?s/(2008-06-23) Me? su? ? eyrum vi? spilum endalaust
```
-2

find -iname '*.flac' | sed 's:/[^/]*$::' | uniq

ar · 2009-03-24 13:26:31 8
Get your external IP address

The same as the other user, but smarter, using -d and -f
This is sample output - yours may be different.
-2

html2text http://checkip.dyndns.org | grep -i 'Current IP Address:'|cut -d' ' -f4

adonis28850 · 2009-08-06 11:30:32 3
Create dummy file

Command to create a dummy file (full of nulls). Useful for testing e.g. file transfers when no file is at hand. bs = blocksize, count = filesize in kilobytes
This is sample output - yours may be different.
-2

dd if=/dev/zero of=filename.file bs=1024 count=10240

harpo · 2012-01-19 08:38:14 14
unpack all rars in current folder

unrar e ... extracts all files into current directory, without archived subdirectories order. unrar x is more accurate command.
This is sample output - yours may be different.
-2

unrar x *.rar

yababay · 2010-12-08 21:50:23 3
Sync two directories
This is sample output - yours may be different.
-2

rsync -a -v --delete sending_directory target_directory

shawn_abdushakur · 2014-02-08 21:07:37 6
View entire process string

Depending on your installation, when you run ps you will only get the first 40 or so characters displayed. In order to view the entire string, use /usr/ucb/ps on Solaris.
This is sample output - yours may be different.
-2

/usr/ucb/ps -auxgww

sharfah · 2009-12-28 12:36:04 3
count number of CPU available for members of a given Virtual Organization

Of course, this command must be executed at a GRID User Interface lhcb - name of your VO, substitute it with the one you are interested it. Show Sample Output
This is sample output - yours may be different.
```
1388123
```
-2

echo `lcg-infosites --vo lhcb ce | cut -f 1| grep [[:digit:]]| tr '\n' '+' |sed -e 's/\ //g' -e 's/+$//'`|bc -l

kbat · 2010-11-10 15:06:00 3
Get connections from a SSH tunnel

This obtains a list of open connections that a user is connected to if he/she is using a SSH tunnel
This is sample output - yours may be different.
-2

netstat -t -p --extend | grep USERNAME

wr8cr8 · 2012-08-07 02:25:54 6
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Ring the system bell after finishing a long script/compile

This will ring the system bell once if your script exits successfully and twice if it fails. So you can go look at something else and it will alert you when done. Don't forget to use 'xset b [vol [pitch [duration]]]' to get the bell to sound the way you want.

connects to a serial console

e.g., 'screen -L /dev/ttyUSB0 38400' listens to your Holux M-241 GPS logger and turns on automatic logging

Remote control for Rhythmbox on an Ubuntu Media PC

Note: you'll want to set up pub-key ssh auth. Gives you a quick means of changing volume/tracks/etc for rhythmbox on a remote machine. E.g.: rc --next # Play next track rc --print-playing # Grab the name rc --volume-down rc --help

Rank top 10 most frequently used commands

check open ports without netstat or lsof

Sort files in multiple directories by date

This sorts files in multiple directories by their modification date. Note that sorting is done at the end using "sort", instead of using the "-ltr" options to "ls". This ensures correct results when sorting a large number of files, in which case "find" will call "ls" multiple times.

Download an Entire website with wget

Use top to monitor only all processes with the same name fragment 'foo'

Like command 10870, but no need for sed

On screen display of a command.

This is very useful if you need to show someone some text from a distance. (Like someone standing over your shoulder...) I'd recommend aliasing it to something like: alias osd_cat="osd_cat -o 400 -s 8 -c blue -d 60 -f -*-bitstream\ vera\ sans-*-*-*--200-*-*-*-*-*-*-*" xosd is the utility that provides osd_cat.

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