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(screen.info)History

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History
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 - Command: history
     (`C-a {')
     Usually users work with a shell that allows easy access to previous
     commands.  For example, `csh' has the command `!!' to repeat the
     last command executed.  `screen' provides a primitive way of
     recalling "the command that started ...": You just type the first
     letter of that command, then hit `C-a {' and `screen' tries to
     find a previous line that matches with the prompt character to the
     left of the cursor. This line is pasted into this window's input
     queue.  Thus you have a crude command history (made up by the
     visible window and its scrollback buffer).