MrNiebieski's personal favorite commands
The design guide-line for this document is "battery-included". This is more of a trick&cheat sheet rather than introductory materials.
For example for ls, I will list a few useful variations:
ls variations:
ll
ls -al
ls -thor
linux Related Shell commands and useful linux operations, etc.
LAMP Related Linux Apache MySQL PHP
c Related makefile/gcc/gdb/valgrind