There's been a few times I've needed to create random numbers. Although I've done so in PERL, I've found Ruby is actually faster. This script generates 20 random "10" digit number NOT A RANDOM NUMBER. Replace 20 (1..20) with the amount of random numbers you need generated

In the example, uid 0 is root. foo:foo are the user:group you want to make owner and group. '.' is the "current directory and below." -print0 and -0 indicate that filenames and directories "are terminated by a null character instead of by whitespace."

a - archive

m5 - compression level, 0= lowest compression...1...2...3...4...5= max compression

-v5M split the output file in 5 megabytes archives, change to 700 for a CD, or 4200 for a DVD

R recursive for directories, do not use it for files

It's better to have the output of a compression already split than use the 'split' command after compression, would consume the double amount of disk space. Found at http://www.ubuntu-unleashed.com/2008/05/howto-create-split-rar-files-in-ubuntu.html

-a for access time, -m for modification time, -c do not create any files, -t timestamp

ramdomize the execution of the command echo 'hello world!'

It happened to me that I got a season of a tv-show which had all files under the same folder like /home/blah/tv_show/season1/file{1,2,3,4,5,...}.avi

But I like to have them like this:

/home/blah/tv_show/season1/e{1,2,3,4,5,...}/file{1,2,3,4,5,...}.avi

So I can have both the srt and the avi on one folder without cluttering much. This command organizes everything assuming that the filename contains Exx where xx is the number of the episode.

You may need to set:

if your filenames have spaces.

exported files will get a .r23 extension (where 23 is the revision number)

change 20 by the number of sessions you want to know (20 it's fair enough)

when sometimes do a "w" or "who" command and see an orphan console session from time ago, you could kill with this command.

where ttyS0 its the console to kill.

change 24073 to your pid

Just find out the daemon with $ netstat -atulpe. Then type in his name and he gets the SIGTERM.

Today's date on a yearly calendar...

credits to http://lifehacker.com/250825/cli-fun--todays-date-on-a-yearly-calendar

does the same, but shows network-prefix.

create an archive of files with access time older than 5 days, and remove original files.

Uses the pid to get the full path of the process. Useful when you do not which command got picked from the path

Affiche des infos detaillees sur vos connexions reseaux.

Port en ?coute, protocole, paquets, adresses, ustilisateur, PID etc...

Permet de lire une video dans une console, meme sans interface graphique.

Interet limite, mais a connaitre au cas ou.

Used for moving stuff around on a fileserver

http://www.google.com

Works under bash on linux. just alter the '-e' option to its corresponding equivalence in your system to execute escape characters correctly.

Pitch-correct play speed with mplayer. You can also use [] and {} keys to change play speed on-the-fly.

rips the audio and video stream of a movie. The two streams are stored separately.