This is very useful tip for all debian users
If you've just bought a new desktop,laptop or server and the box says the box is powered by 2 processors, you can actually verify that.
su is run a shell with substitute user and group IDs. su is used to become another user during a login session. Invoked without a username, su defaults to becoming the super user. The optional argument -- may be used to provide an environment similar to what the user would expect had the user logged in directly.
If you have a folder with a lot of files in a directory and with a specific string that you want to change you can do it in seconds using grep and perl command line
Let us say that you want to rename all of your “.php5″ files to “.php” files. You can use for loop.
"Envy" is an application for Ubuntu Linux and Debian written in Python and PyGTK.
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