From Eli the Computer Guy:
Basic tasks required in order to maintain a Linux server.
Prerequisites: Installing Linux / Introduction to Linux

Basic Commands:

Sudo is used before a command. It acts like „run as administrator” in Windows
Man pages are reference pages for commands and programs
– Example of usage: man ping
– q quits man pages
tasksel command installs numerous programs at one time to create a server (LAMP or such)
– Example: sudo tasksel
Apt-get Installs, Removes or Updates Software
– Install: sudo apt-get install xxx
– Uninstall: sudo apt-get remove xxx
– Update: Sudo apt-get upgrade

Restart Services Example:
sudo /etc/init.d/xxx (restart start stop)

Top is like „Task Manager” in Windows
– Example: sudo top
– K to kill a process
– H for help

Basic navigation
To change to another directory use the cd command
– Example: cd /etc/var/www         (changes to web root folder)

Linux is literal = Capitalization matters !!!    Abc  and abc  are not the same thing!
To Logout just use the exit command