-Helps you look for files based on criteria—like name, filetype, or when they were last edited.
-Class of tools that help you send the output of one command to another command.
-Helps you search through any text within a file on your system for a specific phrase.
-Gives you some serious control over your downloads.
-Connects you to another computer and lets you use its terminal as if you were sitting right in front of it.
-Edits the permissions of any file, letting you read, write, and/or execute a given file according to your specifications.
-Does the same work as Chmod but it’s particularly more useful while working with multiple files.
-Shows you the IP address of your computer, the MAC address of your Ethernet and Wi-Fi cards etc.
Gives you a list of every program running on your system, as well as how much of your system’s resources they’re taking up.
Command line text editor.
source: efytimes: http://www.efytimes.com/