Moving your cursor to the front of a terminal prompt will save you time and frustration. To move your cursor to the front of the terminal prompt in a bash shell session simply use the key binding
C - a
Since it is common that C - a is the key binding for GNU Screen, you have to use:
C - a - a
The other option is to bind it to a key for your shell. In bash, add this line to ~/.bashrc
bind '"\C-p": beginning-of-line'
Then
source ~/.bashrc
Now you can nail that cursor home anywhere with:
C - p
This is the two-step of terminal prompt dance moves. Learn it.