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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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list files recursively by size

a for loop with filling 0 format, with seq

seq allows you to format the output thanks to the -f option. This is very useful if you want to rename your files to the same format in order to be able to easily sort for example: $for i in `seq 1 3 10`; do touch foo$i ;done And $ls foo* | sort -n foo1 foo10 foo4 foo7 But: $for i in `seq -f %02g 1 3 10`; do touch foo$i ;done So $ls foo* | sort -n foo01 foo04 foo07 foo10

Runs previous command replacing foo by bar every time that foo appears

Very useful for rerunning a long command changing some arguments globally. As opposed to ^foo^bar, which only replaces the first occurrence of foo, this one changes every occurrence.

Convert Youtube videos to MP3

Make your own MP3s from Youtube videos.

finding cr-lf files aka dos files with ^M characters

Looking for carriage returns would also identify files with legacy mac line endings. To fix both types: $ perl -i -pe 's/\r\n?/\n/g' $(find . -type f -exec fgrep -l $'\r' "{}" \;)

list files recursively by size

Write comments to your history.

A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

Find the package that installed a command

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" }

awk date convert

Convert readable date/time with `date` command

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