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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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Report information about executable launched on system

Aureport is a tool for displaying auditd system log. -x options cause to display launched executable on system. Aureport work with auditd so auditd must be installed an running on a system. Tested on CentOS / Debian

Test load balancers

With the "--resolve" switch, you can avoid doing DNS lookups or edit the /etc/hosts file, by providing the IP address for a domain directly. Useful if you have many servers with different IP addresses behind a load balancer. Of course, you would loop it: $ for IP in 10.11.0.{1..10}; do curl --resolve subdomain.example.com:80:$IP subdomain.example.com -I -s; done

Print IP of any interface. Useful for scripts.

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" }

Retrieve a list of all webpages on a site

This spiders the given site without downloading the HTML content. The resulting directory structure is then parsed to output a list of the URLs to url-list.txt. Note that this can take a long time to run and you make want to throttle the spidering so as to play nicely.

Find longest running non-root processes on a machine

If you have ever been trying to look for a list of processes based on their elapsed time you don't need to look any further. This command lets you find the list of processes ordered in a reversed order (oldest at the top) that have been running for over an hour on your system. Any system processes are filtered out, leaving only user initiated ones in. I find it extremely useful for debugging and performance analysis.

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

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)

Create strong, but easy to remember password

Why remember? Generate! Up to 48 chars, works on any unix-like system (NB: BSD use md5 instead of md5sum)

vim insert current filename

insert filename Normal mode: "%p Insert mode: %

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