Commands by anarcat

Commands by anarcat (11)

sorted by

Find dead symbolic links
This is sample output - yours may be different.
-2

find -type l -xtype l

anarcat · 2014-07-22 18:48:44 8
A simple command to toggle mute with pulseaudio (any sink)

0 can also be replaced by the source name, e.g. alsa_output.pci-0000_00_1b.0.analog-stereo
This is sample output - yours may be different.
4

pactl set-sink-mute 0 toggle

anarcat · 2014-02-06 04:50:17 12
automatically ditch old versions in a conflict

This is not exactly a commandline, but a vim macro to automatically ditch the "old" version of a conflict when dealing with the naster
This is sample output - yours may be different.
1

qq/<<<<<<^Md/^======^Mdd/>>>>>>^Mdd^M/<<<<<<q

anarcat · 2013-01-23 19:28:23 5
Kill all threads from a MySQL user

Kills all the threads from the user provided in the WHERE request. Can be refined through the SQL request, of course, see http://dev.mysql.com/doc/refman/5.1/en/processlist-table.html for the available columns.
This is sample output - yours may be different.
0

mysql -BNe "SELECT id FROM processlist WHERE user = 'redmine';" information_schema | while read id; do mysqladmin kill $id; done

anarcat · 2012-03-09 17:37:23 8
Monitor MySQL threads per user

This shows the number of threads allocated per user. Show Sample Output
This is sample output - yours may be different.
```
redmine 2
foo     3
bar     3
sysusr  36
```
0

mysql -BNe "SELECT user,COUNT(user) AS count FROM processlist GROUP BY user ORDER BY count;" information_schema

anarcat · 2012-03-09 17:25:23 7
Job Control

background and disown, but with a proper one-line syntax
This is sample output - yours may be different.
3

^z; bg; disown

anarcat · 2011-12-06 20:48:01 12
Copy/move a bunch of files to dot files and back
This is sample output - yours may be different.
1

rename s/^/./ *

anarcat · 2011-12-06 20:44:50 6
List the size (in human readable form) of all sub folders from the current location

All folders, human-readable, no subfolder, with a total. Even shorter.
This is sample output - yours may be different.
-1

du -sch *

anarcat · 2011-12-06 18:38:20 6
see what traffic is mostly hitting you

Sometimes it is useful to have just a general picture of "what is taking all the bandwidth here". Running this command will limit tcpdump to a few packets (instead of flooding your terminal endlessly) and will provide a small, but sometimes sufficient, sample to determine what is going on. Useful to quickly diagnose DOS attacks.
This is sample output - yours may be different.
0

tcpdump -i eth0 -n | head

anarcat · 2011-12-06 18:34:51 4

Lists all listening ports together with the PID of the associated process

Lists all opened sockets (not only listeners), no DNS resolution (so it's fast), the process id and the user holding the socket. Previous samples were limiting to TCP too, this also lists UDP listeners. Show Sample Output

netstat -anpe

anarcat · 2011-12-06 18:27:09 4

Place the argument of the most recent command on the shell

!$ will be expanded to the last argument on the previous command. There are also positionnal parameters like !:1, !:2...
This is sample output - yours may be different.
0

!$

anarcat · 2011-12-06 18:21:09 5

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

Which Twitter user are you?

This will tell you which twitter user you are chronologically. For example, a number of 500 means you were the 500th user to create a twitter account.

Convert IP octets to HEX with no dots.

Converts IP octets to hex using printf command. Useful for generating pxeboot aliases in the pxelinux.cfg folder.

Perl Command Line Interpreter

Can also just use the debug mode like this.

get all Google ipv4 subnets for a iptables firewall for example

multiline data block parse and CSV data extraction with perl

extract data in multiline blocks of data with perl pattern matching loop

Convert text to uppercase

Usage: upper [STRING]...

execute a shell with netcat without -e

Shorter version with proper stderr redirection .

Search some text from all files inside a directory

Easily decode unix-time (funtion)

More recent versions of the date command finally have the ability to decode the unix epoch time into a human readable date. This function makes it simple to utilize this feature quickly.

back ssh from firewalled hosts

host B (you) redirects a modem port (62220) to his local ssh. host A is a remote machine (the ones that issues the ssh cmd). once connected port 5497 is in listening mode on host B. host B just do a ssh 127.0.0.1 -p 5497 -l user and reaches the remote host'ssh. This can be used also for vnc and so on.

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)
» commands by anarcat