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Send an email from the command line

How to send an email from the command line.
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Interact graphically in bash script

How to use X to retrieve the user's choice in a script.
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Change the greeting message in OpenBSD and GNU/Linux

How to change the greeting message in OpenBSD and GNU/Linux in a few seconds.
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Mount an ISO image in Linux

How to mount an ISO image, and access data as if the cd was in your computer.
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SSH cool commands

Here are some interesting uses of SSH. On the program X11 forwarding, remotely run graphical software, access internet through an ssh tunnel ...
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Run a program in a new session on linux

How to use X to retrieve the user's choice in a script.
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Get environment variables in C on linux

Different ways to retrieve environment variables in language C on linux.
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Detect and fix hard drive problems in Linux

If your hard drive has problems, you can test it using badblocks and fsck. And maybe you will be able tu use it again like before...