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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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Remove a range of lines from a file

Deletes lines to of a file. You must put the end line first in the range for the curly brace expansion, otherwise it will not work properly.

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"

'hpc' in the shell - starts a maximum of n compute commands modulo n controlled in parallel, using make

this oneliner uses make and it's jobserver for parallel execution of your script. The '-j' flag for make defines number of subprocesses to launch, '-f' tells make use stdin instead of Makefile. Also make have neat flag '-l', which "Specifies that no new jobs (commands) should be started if there are others jobs running and the load is at least load (a floating-point number)." Also you can use plain Makefile, for better readability: targets = $(subst .png,.jpg,$(wildcard *.png)) $(targets): echo convert $(subst .jpg,.png,$@) $@ all : $(targets)

Resolution of a image

You can use the -format switch to get the size of the image. Replace "logo:" with your image.

find builtin in bash v4+

This command will give you the same list of files as "find /etc/ -name '*killall' | xargs ls -l". In a simpler format just do 'ls /etc/**/file'. It uses shell globbing, so it will also work with other commands, like "cp /etc/**/sshd sshd_backup".

Replace multiple file extensions with a single extension

The above is just a prove of concept based around the nested bash substitution. This could be useful in situations where you're in a directory with many filetypes but you only want to convert a few. $ for f in *.bmp *.jpg *.tga; do convert $f ${f%.*}.png; done or you can use ls | egrep to get more specific... but be warned, files with spaces will cause a ruckus with expansion but the bash for loop uses a space delimited list. $ for f in $(ls | egrep "bmp$|jpg$|tga$"); do convert $f ${f%.*}.png; done I'm guessing some people will still prefer doing it the sed way but I thought the concept of this one was pretty neat. It will help me remember bash substitutions a little better :-P

list files recursively by size

Binary digits Matrix effect

Silly Perl variant.

Get last sleep time on a Mac

Similarly for last wake time: $ sysctl -a | grep waketime

Quickly re-execute a recent command in bash

! will expand to the last time you ran , options and all. It's a nicer alternative to ^R for simple cases, and it's quite helpful for those long commands you run every now and then and haven't made aliases or functions for. It's similar to command 3966, in some sense.

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