Sometimes jittery data hides trends, performing a rolling average can give a clearer view.

attribution: Thanks to repellent on perlmonks.org

source: http://www.perlmonks.org/?node_id=684459

If you want to generate a cross-platform compatible zip file and ignore the Finder's hidden metadata directory

Note that this assumes the application is an SVN checkout and so we have to throw away all the .svn files before making the substitution.

Create a temporary file that acts as swap space. In this example it's a 1GB file at the root of the file system. This additional capacity is added to the existing swap space.

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