Files can only contain bytes, not keystrokes. So, in addition to finding a method of obtaining the keystrokes (Term::ReadKey?), you need to decide how you want to store them.

Update: I interpreted your question rather literally, but you didn't give us much to go on.

In reply to Re: Appending keystrokes to a text file by ikegami
in thread Appending keystrokes to a text file by rsriram

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