All commands

All commands (14,187)

sorted by

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
‹ First < 471 472 473 474 475 > Last ›

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

print/scan lines starting at record ###

Useful for finding newly added lines to a file, tail + can be used to show only the lines starting at some offset. A syslog scanner would look at the file for the first time, then record the end_of_file record number using wc -l. Later (hours, days), scan only at the lines that were added since the last scan.

Add temporary swap space

In addition to a swap partition, Linux can also use a swap file. Some programs, like g++, can use huge amounts of virtual memory, requiring the temporary creation of extra space.

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"

Use AWS CLI and JQ to get a list of instances sorted by launch time

Use the AWS CLI tools to generate a list instances, then pipe them to JQ to show only their launch time and instance id. Finally use sort to bring them out in runtime order. Find all those instances you launched months ago and have forgotten about.

List all installed PERL modules by CPAN

This command will give you the detailed information about the installed perl modules i.e. installed path, Link type, version, files etc.

View internet connection activity in a browser

The output of lsof is piped to txt2html which converts it to html. # Perl module HTML::TextToHTML needed

Get all documents (doc,docx,xls,xlsx,pdf,ppt,pptx,...) linked in a webpage

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" }

list block devices

Shows all block devices in a tree with descruptions of what they are.

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)

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)

All commands (14,187) the last day the last week the last month all time sorted by date votes

What's this?

Check These Out

Stay in the loop…

All commands (14,187)

sorted by