When you are using the Linux tool screen, there are times
that I need to send a ctrl-a character. This is a special command key in
screen that drives most of the other commands. But I use the ctrl-a to go
to the beginning of some of my commands and in order for the terminal to
get a ctrl-a you need to use the following key sequence:
ctrl-a a
So to explain, you need to hold ‘control’ or ‘ctrl’ key and the ‘a’ key together
and then release the ‘ctrl’ key and press ‘a’ key and it will send a ctrl-a to
the terminal.