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List all packages by installed size (Bytes) on rpm distros
This is sample output - yours may be different.
3

rpm -q -a --qf '%10{SIZE}\t%{NAME}\n' | sort -k1,1n

octopus · 2010-04-19 07:44:49 9
Extract title from HTML files

This command can be used to extract the title defined in HTML pages
This is sample output - yours may be different.
3

sed -n 's/.*<title>$.*$<\/title>.*/\1/ip;T;q' file.html

octopus · 2010-04-19 07:41:10 4
Grab a list of MP3s out of Firefox's cache

Grab a list of MP3s (with full path) out of Firefox's cache Ever gone to a site that has an MP3 embedded into a pesky flash player, but no download link? Well, this one-liner will yank the *full path* of those tunes straight out of FF's cache in a clean list. Shorter and Intuitive version of the command submitted by (TuxOtaku) Show Sample Output
This is sample output - yours may be different.
```
/home/sata/.mozilla/firefox/xmr8lfrq.default/Cache/FD44AC63d01
/home/sata/.mozilla/firefox/xmr8lfrq.default/Cache/C4C20071d01
/home/sata/.mozilla/firefox/xmr8lfrq.default/Cache/CD40802Cd01
```
2

find ~/.mozilla/firefox/*/Cache -exec file {} \; | awk -F ': ' 'tolower($2)~/mpeg/{print $1}'

sata · 2010-04-19 06:59:55 3
Launch a game, like Tetris, when apt-get installing an app larger than 50 Megabytes

Change the APP variable's value to whatever you want to install. Depending on how fast your machine is, you'll want to adjust the value 50 to something else. You might also want to play a different game than Gnometris - just make sure it's a GUI game.
This is sample output - yours may be different.
2

APP=wine; if [ $(sudo apt-get --print-uris -y install $APP | sed -ne 's/^After this operation, $[0-9]\{1,\}$.*MB.*/\1/p') -gt 50 ]; then gnometris 2>/dev/null & sudo apt-get install $APP; else sudo apt-get install $APP; fi

rkulla · 2010-04-18 19:32:26 39
Remove comments and empty lines from a file

Removes all empty lines: ^$ and all lines starting with hash: ^# Show Sample Output
This is sample output - yours may be different.
```
/dev/sdd {
spindown_time = 241
}
/dev/sdf {
spindown_time = 241
}
```
0

grep -v '^#\|^$' /etc/hdparm.conf

SuperJediWombat · 2010-04-18 08:01:07 3
remove empty lines
This is sample output - yours may be different.
4

sed '/^$/d'

er0k · 2010-04-18 00:52:00 5

Find all files currently open in Vim and/or gVim

Catches .swp, .swo, .swn, etc. If you have access to lsof, it'll give you more compressed output and show you the associated terminals (e.g., pts/5, which you could then use 'w' to figure out where it's originating from): lsof | grep '\.sw.$' If you have swp files turned off, you can do something like: ps x | grep '[g,v]im', but it won't tell you about files open in buffers, via :e [file]. Show Sample Output

vim -r 2>&1 | grep '\.sw.' -A 5 | grep 'still running' -B 5

rkulla · 2010-04-17 19:43:35 4

convert ascii string to hex
This is sample output - yours may be different.
1

echo $ascii | perl -ne 'printf ("%x", ord($1)) while(/(.)/g); print "\n";'

dfaulkner · 2010-04-17 16:26:29 3
convert a string of hex characters into ascii chars
This is sample output - yours may be different.
0

echo $hex | perl -pe 's/(..)/chr(hex($1))/ge'

dfaulkner · 2010-04-17 16:24:48 5
apache , how to avoid bugs and start directly the server

This command is designed in order to avoid this error : /etc/init.d/apache2 force-reload * Reloading web server config apache2 httpd not running, trying to start (13)Permission denied: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs [fail] Show Sample Output
This is sample output - yours may be different.
```
* Starting web server apache2                                           [ OK ] 
```
-9

cd /etc/init.d && sudo ./apache2 start

nco · 2010-04-17 16:01:18 3
Short alias for sudo

This is way faster than typing 'sudo'. And AFAIK - there is no decent command for letter 's'.
This is sample output - yours may be different.
-12

alias s='sudo'

eimantas · 2010-04-17 11:30:55 9

pimp text output e.g. "Linux rocks!" to look nice

Show Sample Output

figlet Linux rocks!

tuxilicious · 2010-04-17 11:20:20 7

pimp text output e.g. "Linux rocks!" to look nice

Show Sample Output
This is sample output - yours may be different.
```
 ______________ 
< Linux rocks! >
 -------------- 
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||
```
1

cowsay Linux rocks!

tuxilicious · 2010-04-17 11:10:29 4
Lock the hardware eject button of the cdrom

This command will lock the hardware eject button of your cdrom drive. Some uses are: 1: If you have a toddler and has discovered the cdrom button 2: If you are carrying a laptop in a bag or case and don't want it to eject if the button is inadvertently pressed. To unlock the button use: eject -i 0 Show Sample Output
This is sample output - yours may be different.
```
CD-Drive may NOT be ejected with device button
```
5

eject -i 1

mdelatorre · 2010-04-17 02:27:07 6
Combining text files into one file

the last person who posted used the most roundabout way to concatinate files, there's a reason there's a "conCATinate" command... Using this method, you also get to choose the order of the files, below another person just did *.txt > combined.txt which is fine but the order depends on the implementation of "cat" which is probably alphabetical order of filenames. Show Sample Output
This is sample output - yours may be different.
```
$cat stdHeader tableOfContents introduction body conclusion worksCited index  > researchPaper
$pwd; ls;
/home/ginoman/researchPapers/sample/
body                conclusion                index
introduction        researchPaper             stdHeader
tableOfContents     worksCited
$
```
-4

cat file1 ... fileN > combinedFile;

GinoMan2440 · 2010-04-17 01:00:04 4
Play files with mplayer, including files in sub-directories, and have keyboard shortcuts work

Press > or < to go to the next or previous track. Space to toggle play/pause, etc. It creates a temp file descriptor. To see where the file descriptor gets created type: echo <(echo foo) This works better than running find first, then piping to mplayer with xargs or something, because that won't let you use keyboard shortcuts.
This is sample output - yours may be different.
0

mplayer -playlist <(find $PWD -type f)

rkulla · 2010-04-17 00:20:08 6
Get your outgoing IP address
This is sample output - yours may be different.
2

curl icanhazip.com

unixmonkey9355 · 2010-04-16 23:13:30 3
Get a count of how many file types a project has

I created this command to give me a quick overview of how many file types a directory, and all its subdirectories, contains. It works based off file extension, rather than file(1)'s magic output, because it ended up being more accurate and less confusing. Files that don't have an ext (README) are generally not important for me to want to count, but you're free to customize this fit your needs. Show Sample Output
This is sample output - yours may be different.
```
    FILE TYPE        TOTAL
         .ico        1
         .jpg        17
         .log        1
         .php        104
         .png        44
```
0

printf "\n%25s%10sTOTAL\n" 'FILE TYPE' ' '; for ext in $(find . -iname \*.* | egrep -o '\.[^[:space:].]+$' | egrep -v '\.svn*' | sort -f | uniq -i); do count=$(find . -iname \*$ext | wc -l); printf "%25s%10s%d\n" $ext ' ' $count; done

rkulla · 2010-04-16 21:12:11 3
Play all the music in a folder, on shuffle

Page up for next song
This is sample output - yours may be different.
2

mplayer -shuffle *

ProfOak · 2010-04-16 20:53:40 16
make directory with current date

Show Sample Output
This is sample output - yours may be different.
```
gnu@robby:/tmp/$ mkdir $(date +%Y_%m_%d) 
gnu@robby:/tmp/$ ls 
2010_04_16
```
2

mkdir $(date +%Y_%m_%d)

eastwind · 2010-04-16 17:23:40 8
Combining text files into one file
This is sample output - yours may be different.
3

cat *.txt >output.txt

jmcantrell · 2010-04-16 14:06:47 6
Legacy MacOS to Unix text convert using perl
This is sample output - yours may be different.
0

perl -i -pe 's/\r/\n/g' file

octopus · 2010-04-16 13:25:09 4
Combining text files into one file
This is sample output - yours may be different.
-16

ls | grep *.txt | while read file; do cat $file >> ./output.txt; done;

octopus · 2010-04-16 13:19:38 6
Run command from another user and return to current
This is sample output - yours may be different.
1

su - $user -c <command>

octopus · 2010-04-16 13:17:02 3
umount sshfs mounted directory
This is sample output - yours may be different.
0

fusermount -u ~/sshfs_mounted_directory

eastwind · 2010-04-16 10:54:39 3
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list block devices

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

Get the total length of time in hours:minutes:seconds (HH:MM:SS) of all video (or audio) in the current dir (and below)

change the *.avi to whatever you want to match, you can remove it altogether if you want to check all files.

Beep siren

Infinitely plays beeps with sinusoidally changing sound frequency. Ideal for alarm on an event.

Make vim open in tabs by default (save to .profile)

I always add this to my .profile rc so I can do things like: "vim *.c" and the files are opened in tabs.

remove all spaces from all files in current folder

Remove BOM (Byte Order Mark) from text file

Takes file (text.txt), removes BOM from it, and outputs the result to a new file (newFile.txt). BOM is "Byte Order Mark" ([http://en.wikipedia.org/wiki/Byte_order_mark]), an invisible, non-breaking, zero-length character. In other words, if you see a DIFF with "" at the beginning, you've got a byte order mark, which can't be removed without this command or a hex editor. It can appear for a number of reasons, such as getting copied to/from a UNIX filesystem...

When was your OS installed?

remove OSX resource forks ._ files

DESCRIPTION For each dir, dot_clean recursively merges all ._* files with their cor- responding native files according to the rules specified with the given arguments. By default, if there is an attribute on the native file that is also present in the ._ file, the most recent attribute will be used. If no operands are given, a usage message is output. If more than one directory is given, directories are merged in the order in which they are specified.

Lookup errno defintions

Calls the POSIX strerror() function to look up the meaning of integer ERRNOs set by some functions.

Combines an arbitrary number of transparent png files into one file

This one liner; combines all sequentially numbered files; in this example IMG_0001.png to IMG_1121.png by generating the shell script, making the shell script executable and then running the shell script to combine the 1121 png into a single png file named _final.png tested on Mac OS X 10.6.3 with ImageMagick 6.5.8-0 2009-11-22 Q16 http://www.imagemagick.org

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