screen

Beginning of line in UNIX screen session:

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As you know every "screen" command begins with "Ctrl-a", then how to go to beginning of the line when you are working under a "screen" UNIX session (which we achieve by "Ctrl-a" in a normal UNIX session) ? 

Solution:

Under a "screen" UNIX session you can do "Ctrl-a a" to move to the beginning of the line. 

So in order to print ^A (hex: \x01) in a UNIX "screen" session, usual  "Ctrl-v Ctrl-a" will not work, you will type "Ctrl-v Ctrl-a a" to print ^A.