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how many packages installed on your archlinux?
This is sample output - yours may be different.
8

pacman -Q|wc -l

freenight · 2009-07-31 08:01:13 4
Get Futurama quotations from slashdot.org servers
This is sample output - yours may be different.
-4

echo -e "HEAD / HTTP/1.1\nHost: slashdot.org\n\n" | nc slashdot.org 80 | head -n5 | tail -1 | cut -f2 -d-

beerbrain · 2009-07-31 06:49:52 3
Get Futurama quotations from slashdot.org servers
This is sample output - yours may be different.
2

lynx -head -dump http://slashdot.org|egrep 'Bender|Fry'|sed 's/X-//'

linuxrawkstar · 2009-07-30 19:53:16 3
Get Futurama quotations from slashdot.org servers

slashdot.org webserver adds an X-Bender or X-Fry HTTP header to every response! Show Sample Output
This is sample output - yours may be different.
```
Bender: Emotions are dumb and should be hated.
```
5

echo -e "HEAD / HTTP/1.1\nHost: slashdot.org\n\n" | nc slashdot.org 80 | egrep "Bender|Fry" | sed "s/X-//"

ricardoarguello · 2009-07-30 19:15:07 3
Have an ssh session open forever

Open a ssh session opened forever, great on laptops losing Internet connectivity when switching WIFI spots.
This is sample output - yours may be different.
20

autossh -M50000 -t server.example.com 'screen -raAd mysession'

ricardoarguello · 2009-07-30 18:58:37 10

Determine what version of bind is running on a dns server.

Due to the recent dynamic update vulnerability with bind, I was forced to dig a little deeper into dig... Show Sample Output

dig -t txt -c chaos VERSION.BIND @<dns.server.com>

din7 · 2009-07-30 18:38:39 10

Sort IPV4 ip addresses
This is sample output - yours may be different.
5

sort -t. -k1,1n -k2,2n -k3,3n -k4,4n

hemanth · 2009-07-30 17:07:34 3
ISO info

Get details about an ISO image , without burning it or mounting it .
This is sample output - yours may be different.
3

isoinfo -d -i filename.iso

hemanth · 2009-07-30 17:01:30 9
Batch File Rename with awk and sed
This is sample output - yours may be different.
3

ls foo*.jpg | awk '{print("mv "$1" "$1)}' | sed 's/foo/bar/2' | /bin/sh

opexxx · 2009-07-30 13:54:12 17
rename a file to its md5sum
This is sample output - yours may be different.
1

md5sum * | sed 's/^$\w*$\s*$.*$/\2 \1/' | while read LINE; do mv $LINE; done

opexxx · 2009-07-30 13:41:39 5
Search for specific IPs taken form a text file within the apache access log

bnd-ips.txt is a list of IP adresses that is concenated for use as regular expression. Yes, this is still very speedy ;=)
This is sample output - yours may be different.
0

grep -E ":(`cat bnd-ips.txt | sed 's/\./\\./g' | tr '\n' '|'`)" access.log

Cowboy · 2009-07-30 12:54:55 6
Make a statistic about the lines of code

use find to grep all .c files from the target directory, cat them into one stream, then piped to wc to count the lines Show Sample Output
This is sample output - yours may be different.
```
18186
or some number else
```
1

find . -type f -name "*.c" -exec cat {} \; | wc -l

foremire · 2009-07-30 10:06:51 14
uncomment the lines where the word DEBUG is found
This is sample output - yours may be different.
9

sed '/^#.*DEBUG.*/ s/^#//' $FILE

svg · 2009-07-30 09:30:17 18
put all lines in comment where de word DEBUG is found
This is sample output - yours may be different.
8

sed -i 's/^.*DEBUG.*/#&/' $file

svg · 2009-07-30 09:20:37 77
append content of a file to itself

The command `cat file >> file` failes with the following error message: cat: file: input file is output file `tee` is a nice workaround without using any temporary files. Show Sample Output
This is sample output - yours may be different.
```
echo "Just one line" >> file
cat file
> Just one line
cat file | tee >> file
cat file
> Just one line
> Just one line
```
0

cat file | tee >> file

GeckoDH · 2009-07-30 07:34:03 7
Connect to irssi over ssh

This will launch and irssi session on your server. If it's not running, it will create the session. If it's running it'll connect to it and destroy any other connections. If compositing is available, the rxvt window will have transparency added. This window will also open maximized. Anything else this does should be easily figured out in the man pages.
This is sample output - yours may be different.
-1

rxvt-unicode -g 999x999 -sr -depth 32 -bg rg-ba:0000/0000/0000/dddd +sb -T irssi -n irssi -name irssichat -e ssh server.com -Xt screen -aAdr -RR irssi irssi

MTecknology · 2009-07-30 04:53:17 4
Gentoo: Get the size of all installed packets, sorted

On a Gentoo system, this command will tell you which packets you have installed and sort them by how much space they consume. Good for finding out space-hogs when tidying up disk space. Show Sample Output
This is sample output - yours may be different.
```
alanceil@kvirasim:03:06:2:0:~> equery s | sed 's/(\|)/ /g' | sort -n -k 9 | gawk '{print $1" "$9/1048576"m"}'
app-text/scrollkeeper-9999-r1: 0m
gnome-base/gail-1000: 0m
--- *snip* ---
dev-java/sun-jdk-1.6.0.13: 158.84m
games-puzzle/neverball-1.5.0: 174.607m
app-office/openoffice-bin-3.0.0: 380.035m
```
1

equery s | sed 's/(\|)/ /g' | sort -n -k 9 | gawk '{print $1" "$9/1048576"m"}'

Alanceil · 2009-07-30 01:12:10 6
Count all conections estabilished on gateway
This is sample output - yours may be different.
3

cat /proc/net/ip_conntrack | grep ESTABLISHED | grep -c -v ^#

flamarion · 2009-07-29 20:21:25 5
Save man pages to pdf
This is sample output - yours may be different.
7

man -t man | ps2pdf - > man.pdf

hemanth · 2009-07-29 16:57:14 7
Make shell (script) low priority. Use for non interactive tasks
This is sample output - yours may be different.
2

renice 19 -p $$

hemanth · 2009-07-29 16:56:22 3
txt2html

Convert Text to HTML
This is sample output - yours may be different.
1

recode ..HTML < file.txt > file.html

hemanth · 2009-07-29 16:27:38 6
Restart web server
This is sample output - yours may be different.
-9

apachectl restart

skozix · 2009-07-29 16:23:46 4
Restart web server
This is sample output - yours may be different.
-16

apache2ctl graceful

jdecuyper · 2009-07-29 15:27:14 6
List all installed Debian packages

Should work on all systems that use dpkg and APT package management. Show Sample Output
This is sample output - yours may be different.
```
acpi
acpi-support
acpi-support-base
acpid
adduser
anacron
ant
antlr
apmd
apt
apt-utils
aptitude
aspell
```
1

dpkg --get-selections | grep -v deinstall | cut -f 1

oldo · 2009-07-29 14:37:36 8
Delete all but latest file in a directory

Useful for deleting old unused log files.
This is sample output - yours may be different.
6

ls -pt1 | sed '/.*\//d' | sed 1d | xargs rm

patko · 2009-07-29 13:59:58 7
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Setting global redirection of STDERR to STDOUT in a script

You have a script where =ALL= STDERR should be redirected to STDIN and you don't want to add "2>&1" at the end of each command... E.G.: $ ls -al /foo/bar 2>&1 Than just add this piece of code at the beginning of your script! I hope this can help someone. :)

a simple bash one-liner to create php file and call php function

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)

Jump to a directory, execute a command and jump back to current dir

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Open Finder from the current Terminal location

I did not know this, i'd like to share...

Encrypted archive with openssl and tar

The lifehacker way: http://lifehacker.com/software/top/geek-to-live--encrypt-your-data-178005.php#Alternate%20Method:%20OpenSSL "That command will encrypt the unencrypted-data.tar file with the password you choose and output the result to encrypted-data.tar.des3. To unlock the encrypted file, use the following command:" $ openssl des3 -d -salt -in encrypted-data.tar.des3 -out unencrypted-data.tar

Gets the X11 Screen resolution

Requires xrandr, grep and, sed.

Search and play youtube videos directly to terminal (no X needed)

pyt 'Stairway to heaven - Led Zeppelin' pyt 'brain damage - Pink Floyd' No web browser or even X needed. Just a cli and internet connection! mplayer is pauseable and can skip ahead This may break if youtube changes their search html.

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"

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