This post contains a collection of useful Linux commands for the Ubuntu distribution. The list is extended every time I find a new handy command. Most of the commands are also applicable to other Linux distributions.
File System Commands
Description
EXAMPLE
Display Current Working Directory
pwd
Change Current Working Directory
cd /path/to/directory
Show All Files in Current Directory (Including Hidden Ones)
ls -la
Show Sizes of All Files and Directories in Current Directory