The 1 page Linux CommandManual
Linux Command Reference
Linux Security Quick Reference
The Gimp Hotkey Reference

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Fun with rename:
1) To rename filenames with CAPS characters to lowercase:
rename ‘y/A-Z/a-z/’ *
2) To remove <spaces> from filenames:
rename ’s/ /-/g’ *
3) To strip files with the .bak extension:
rename ’s/\.bak$//’ *.bak

Free: The free command displays the amount of free and used memory in the system. For example, free -m gives the information using megabytes, which is [...]

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Tips from IBM, not all that complicated, but worth looking at.
Other tips include…

Sharing computers on a Linux (or heterogeneous) network.
IBM’s top 10 Linux articles and tutorials.
Miscellaneous tips.
Linux-powered networking: Part 1, Part 2 and Part 3.
Industrial-strength Linux box lockdown, a howto: Part 1 and Part 2.
Introduction to cryptology concepts: Part 1, Part 2 and Part [...]

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Source: LinuxHaxor.net
Essentially RTorrent, CTorrent and Transmission-CLI.

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Source for this great article: Linux.com
In this context, a one-liner is a set of commands normally joined through a pipe (|). When joined by a pipe, the command on the left passes its output to the command on the right. Simple or complex, you can get useful results from a single line at the bash [...]

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1. lsb_release -a
2. The watch command.
3. Command line intro summary, with some rarely used switches (TLDP).
4. If you’re using a system which has a lot of users, and you’d like to see who has started a particular script, daemon, or binary, then the pstree utility is very helpful. It draws a tree of all [...]

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