Handy Mac OSX shortcuts to work with Terminal

Clean up the line: You can use Ctrl+U to clear up to the beginning.

Clean up the line: Ctrl+A Ctrl+K to wipe the current line in the terminal 

Cancel the current command/line: Ctrl+C.

Recall the deleted command: Ctrl+Y

Go at the beginning of the line: Ctrl+A

Go at the end of the line: Ctrl+E

Remove the forward words for example, if you are middle of the command: Ctrl+K

Remove characters on the left, until the beginning of the word: Ctrl+W

To clear your entire command prompt: Ctrl + L

Toggle between the start of line and current cursor position: Ctrl + XX

Source : http://stackoverflow.com/questions/9679776/how-do-i-clear-delete-the-current-line-in-terminal