Bash provides many hot keys to ease use. Like

ctrl-l  -- clear screen
ctrl-r  -- does a search in the previously given commands so that you don't 
                have to repeat long command.
ctrl-u  -- clears the typing before the hotkey.
ctrl-a  -- takes you to the begining of the command you are currently typing.
ctrl-e  -- takes you to the end of the command you are currently typing in.
esc-b   -- takes you back by one word while typing a command.
ctrl-c  -- kills the current command or process.
ctrl-d  -- kills the shell.
ctrl-h  -- deletes one letter at a time from the command you are typing in.
ctrl-z  -- puts the currently running process in background, the process 
                can be brought back to run state by using fg command.
esc-p  -- like ctrl-r lets you search through the previously given commands.
esc-.  -- gives the last command you typed.