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2011-03-12 - Confoo 2011 presentation
Slides are available from the commandlinefu presentation at Confoo 2011: http://presentations.codeinthehole.com/confoo2011/
2011-01-04 - Moderation now required for new commands
To try and put and end to the spamming, new commands require moderation before they will appear on the site.
2010-12-27 - Apologies for not banning the trolls sooner
Have been away from the interwebs over Christmas. Will be more vigilant henceforth.
2010-09-24 - OAuth and pagination problems fixed
Apologies for the delay in getting Twitter's OAuth supported. Annoying pagination gremlin also fixed.




All commands from sorted by
Terminal - All commands - 11,928 results
:n,m w newfile.txt
2009-03-02 19:40:34
User: milmazz
Tags: vim perl

On command mode in Vim you can save parts of the current buffer in another file.

* The 'n' value represents the first line of the new file.

* The 'm' value represents the last line of the new file.

* newfile.txt is the newfile.

The results are similar to this command in perl:

perl -ne 'print if n..m' in.sql > out.sql
2009-03-02 19:03:07
User: Pistos

Immediately after installing things into your PATH (e.g. under /usr/bin), currently open shells cannot find them ("zsh: command not found"). Use rehash to get the shell to rescan available executables.

sudo find / -type f \( -perm /4000 -a -user root \) -ls -o \( -perm /2000 -a -group root \) -ls
2009-03-02 18:48:17
User: atoponce
Functions: find sudo

Discovering all executables on your system that can be run as another user, especially root, is critical for system security. The above command will find those files with have SUID or SGID bits set and are owned by the root user or group.

du -cs * .[^\.]* | sort -n
2009-03-02 18:43:48
User: cemsbr
Functions: du sort

Very useful when you need disk space. It calculates the disk usage of all files and dirs (descending them) located at the current directory (including hidden ones). Then sort puts them in order.

cat /dev/zero > /dev/null &
2009-03-02 18:18:52
User: gustavold
Functions: cat

Just waste some resources in a philosophical way

find <top_level_dir> -depth -type d -empty -exec rmdir -v {} \;
find -type -f -exec cp {} {}.bak \;
nc -l -p 2000 -e /bin/bash
2009-03-02 15:58:25
User: prayer
Tags: Network netcat

To connect to the shell run:

nc server.example.org 2000
nc -l -p 2000 < song.mp3
2009-03-02 14:55:56
User: raphink
Tags: man

Launch a command from within a manpage, vim style. This is rather trivial, but can be very useful to try out the functions described in a manpage without actually quitting it (or switching to another console/screen/...).

rm file{1..10}
2009-03-02 14:42:05
User: atoponce
Functions: rm

Rather than typing out all 10 files, you can use brace expansion to do the trick for you. This is useful for backup files, numbered files, or any files with a repeating pattern. Gives more control than 'rm file*' as I might want to keep others around.

yum localinstall /path/to/package.rpm
2009-03-02 14:32:23
User: atoponce

When downloading RPMs from the Internet, you don't have to 'rpm -i' or 'rpm -U' to install the package. Especially, if the package has dependencies. If you have YUM setup to access an RPM repository, this command will install the downloaded package, then any dependencies through YUM that it relies on. Very handy on RPM-based systems.

tail -n 0 -f /var/log/messages
2009-03-02 14:21:18
User: atoponce
Functions: tail

In this case, I'm keeping an eye on /var/log/messages, but of course any file will do. When I'm following a file, I generally don't want to see anything other than what has been added due to the command or service I've executed. This keeps everything clean and tidy for troubleshooting.

tail -f file1 (file2 .. fileN)
2009-03-02 11:13:42
User: hberth
Functions: tail
Tags: bash Ubuntu

Useful to e.g. keep an eye on several logfiles.

tail -n 15 /var/log/yum.log | tac
2009-03-02 08:56:04
User: alcik
Functions: tail
Tags: yum tail

It displays, last 15 yum operations (in last operation as first row order) with its dates. Change 15 to any number of operations you need to display or remove "| tac" to see it in reverse order (last operation as last row)

vlc $(curl -s http://twitter.com/statuses/user_timeline/18855500.rss|grep play|sed -ne '/<title>/s/^.*\(http.*\)<\/title/\1/gp'|awk '{print $1}')
2009-03-02 05:36:19
User: tomwsmf
Tags: twitter

This will play the audio goodness posted up on PlayTweets via twitter right form the ever loving cmdline. You do not even need a twitter account. I hashed this out in a bit of a hurray as the kids need to get to sleep....I will be adding a loop based feature that will play new items as they come in...after what your are listening to is over.

http://twitter.com/playTweets for more info on playtweets

sar -u 2 5
2009-03-02 04:54:37
User: rockon

Generated the CPU utilization stats with 5 lines /every 2 seconds.

Needs sysstat package to be installed prior to use sar.

lsof +p xxxx
cp /some/path/to/myfile{,.back}
2009-03-02 04:41:18
User: rockon
Functions: cp

Copy the file with the given .extension at the source file's location. Eliminates the typing of long paths again and again.

2009-03-02 03:01:13
User: leonza99
Tags: vim

Replace all ocurrences in the file.

The g option is to replace more than one occurrence in the same line. Whitout the g option, it only replace the first occurrence in the line.

mv filename.{old,new}
find . -type f | while read file; do cp $file ${file}.bak; done
2009-03-01 23:42:49
User: atoponce
Functions: cp find read

This is a simple case of recursing through all directories, adding the '.bak' extension to every file. Of course, the 'cp $file $file.bak' could be any code you need to apply to your recursion, including tests, other functions, creating variables, doing math, etc. Simple and clean recursion.

sudo find / -mmin 60 -type f
2009-03-01 23:03:31
User: atoponce
Functions: find sudo

Useful mainly for debugging or troubleshooting an application or system, such as X11, Apache, Bind, DHCP and others. Another useful switch that can be combined with -mmin, -mtime and so forth is -daystart. For example, to find files that were modified in the /etc directory only yesterday:

sudo find /etc -daystart -mtime 1 -type f
nc -l -p 2000 -c "nc example.org 3000"
2009-03-01 21:28:39
User: prayer
Tags: Network netcat

Redirect the local port 2000 to the remote port 3000. The same but UDP:

nc -u -l -p 2000 -c "nc -u example.org 3000"

It may be used to "convert" TCP client to UDP server (or viceversa):

nc -l -p 2000 -c "nc -u example.org 3000"