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May 19, 2015 - A Look At The New Commandlinefu
I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management
I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!

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Terminal - All commands - 12,420 results
cdrecord dev=0,0,0 -v -eject yourimage.iso
2009-04-17 23:44:22
User: rissajeanne
Functions: cdrecord

cdrecord -scanbus will tell you the (x,y,z) value of your cdr (for example, mine is 3,0,0)

echo *
2009-04-17 21:40:58
User: kFiddle
Functions: echo
Tags: echo ls

Sometimes "ls" is just too slow, especially if you're having problems with terminal scroll speed, or if you're a speed freak. In these situations, do an echo * in the current directory to immediately see the directory listing. Do an echo * | tr ' ' '\n' if you want a column. Do an alias ls='echo *' if you want to achieve higher echelons of speed and wonder. Note that echo * is also useful on systems that are so low in memory that "ls" itself is failing - perhaps due to a memory leak that you're trying to debug.

hostname -i
2009-04-17 21:26:56
User: kFiddle
Functions: hostname
Tags: IP hostname

I've seen some versions of hostname that don't have the -i option, so this may not work everywhere. When available, it's a better alternative than using ifconfig and wasting eyeball muscle to search for the address, and it's definitely simpler than using awk/sed.

ssh user@server | tee logfilename
2009-04-17 19:17:02
User: bassu
Functions: ssh tee

Optionally, you can create a new function to do this with a custom command. Edit $HOME/.bashrc and add:

myssh () { ssh $1 | tee sshlog ; }

Save it.

At command prompt:

myssh user@server
2009-04-17 13:16:56
User: minliu2k
Functions: cat

^V means CTRL-V

[ENTER] means ENTER key

lsof -c dhcpd
2009-04-17 07:18:38
User: d4n3sh

List all file opened by a particular command based on it's command name.

lsof -p 15857
find /usr/ -type l ! -xtype f ! -xtype d -ok rm -f {} \;
xmlstarlet ed -d '//comment()' $XML_FILE
2009-04-16 23:00:47
User: minliu2k
Functions: ed

In Redhat, xmlstarlet is called just xml which can be found in xmlstarlet RPM.

xmms2 mlib search NOT +rating | grep -r '^[0-9]' | sed -r 's/^([0-9]+).*/\1/' | sort -R | head | xargs -L 1 xmms2 addid
2009-04-16 20:27:30
Functions: grep head sed sort xargs

If you're like me and want to keep all your music rated, and you use xmms2, you might like this command.

I takes 10 random songs from your xmms2 library that don't have any rating, and adds them to your current playlist. You can then rate them in another xmms2 client that supports rating (I like kuechenstation).

I'm pretty sure there's a better way to do the grep ... | sed ... part, probably with awk, but I don't know awk, so I'd welcome any suggestions.

sort -u filename > newfilename
2009-04-16 20:00:34
User: deijmaster
Functions: sort

For users looking to simplify management of large entries in files and directories, this command is the key to fun and simplicity. Using the power sort, only a couple of seconds are necessary to accomplish what would take minutes or hours in ?standard? client applications.

svn list -R https://repository.com --xml >> svnxxmlinfo.xml
2009-04-16 18:58:18
User: iheartbash

I use this to pull the last commit date for everything in my repo, so I can tell the client which files haven't been touched or updated since the repo was created. Another way to do it is to use svn log, but that does not pull the "kind" attribute. It does, however, give you the commit message. Both are very useful.

ffmpeg -i movie.avi -y -f vcd -vcodec mpeg1video -map 0.0:0.0 -b 1150 -s 352x240 -r 29.97 -g 12 -qmin 3 -qmax 13 -acodec mp2 -ab 224 -ar 44100 -ac 2 -map 0.1:0.1 movie.mpg
lsof -i tcp:80
2009-04-16 14:51:53
User: ar_levi

Sometimes you need to use a port that is already opened by some program , and you don't know who to "kill" for it to release - so, now you do !

find /path/to/my/files/ -type f -name "*txt*" | xargs du -k | awk 'BEGIN{x=0}{x=x+$1}END{print x}'
2009-04-16 14:17:04
Functions: awk du find xargs

Use the find command to match certain files and summarise their total size in KBytes.

locate searchstring | xargs grep foo
2009-04-16 12:51:24
User: zimon
Functions: grep locate xargs
Tags: grep locate

Greps located files for an expression.

Example greps all LaTeX files for 'foo':

locate *.tex | xargs grep foo

To avoid searching thousands of files with grep it could be usefull to test first how much files are returned by locate:

locate -c *.tex
sed '/^/R addfile' targetfile > savefile
2009-04-16 05:11:07
User: tobiasboon
Functions: sed

After every line in targetfile (empty lines included) insert in a line from addfile. "Save" results to savefile. Addfile should be longer than targetfile since this doesn't loop back to the top of addfile.

/^/R addfile -- says for every line that matches "has a start of line" output a line from the file addfile.

> savefile (optional) -- redirect output to savefile file.

awk '/sshd/ && /Failed/ {gsub(/invalid user/,""); printf "%-12s %-16s %s-%s-%s\n", $9, $11, $1, $2, $3}' /var/log/auth.log
2009-04-16 00:56:23
User: frailotis
Functions: awk printf

A variation of a script I found on this site and then slimmed down to just use awk. It displays all users who have attempted to login to the box and failed using SSH. Pipe it to the sort command to see which usernames have the most failed logins.

x0vnc4server -display :0 -PasswordFile ~/.vnc/passwd
egrep -ci ^[aoeuidhtns-]+$ /usr/share/dict/words
2009-04-15 20:31:46
User: atoponce
Functions: egrep

Quick and dirty command that counts how many words can be typed just using the home row on the Dvorak Simplified Keyboard layout from a dictionary file, in this case /usr/share/dict/words.

According to the regular expression supplied, each word must contain all the keys on the Dvorak home row, and no other characters. For comparison, I've shown how many words are installed in my dictionary, how many can be typed with just the Dvorak home row and how many can be typed with just the QWERTY home row in the sample output. Nearly 10 times the amount.

If you want to see the words, remove the -c switch, and each word will be printed out.

cat <filename> | perl -e '$/ = ""; $_ = <>; s/<!--.*?-->//gs; print;'
2009-04-15 20:29:11
User: unixx
Functions: cat perl

xml with verbose commenting can be difficult to read. remove comments from xml.

echo -e "aa\nbb\ncc\ndd\n123" | sed -e :a -e "/$/N; s/\n/;/; ta"
wget -q -O - "$@" <url>
echo "12345,12346" |sed -e's/ //'|tr "," "\n"| while read line; do echo -n $line" "; svn log -vr $line https://url/to/svn/repository/|grep "/"|head -1|cut -d"/" -f2; done
date -r foo