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(screen.info)Command Character

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Command Character
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 - Command: escape xy
     (none)
     Set the command character to X and the character generating a
     literal command character (by triggering the `meta' command) to Y
     (similar to the `-e' option).  Each argument is either a single
     character, a two-character sequence of the form `^x' (meaning
     `C-x'), a backslash followed by an octal number (specifying the
     ASCII code of the character), or a backslash followed by a second
     character, such as `\^' or `\\'.  The default is `^Aa', but ```'
     is recommended by one of the authors.

 - Command: defescape xy
     (none)
     Set the default command characters. This is equivalent to the
     command `escape' except that it is useful for multiuser sessions
     only.  In a multiuser session `escape' changes the command
     character of the calling user, where `defescape' changes the
     default command characters for users that will be added later.

 - Command: meta
     (`C-a a')
     Send the command character (`C-a') to the process in the current
     window.  The keystroke for this command is the second parameter to
     the `-e' command line switch (Note: Invoking Screen), or the
     `escape' .screenrc directive.

 - Command: command [-c CLASS]
     (none)
     This command has the same effect as typing the screen escape
     character (`C-a'). It is probably only useful for key bindings.
     If the `-c' option is given, select the specified command class.
     Note: Bind, Note: Bindkey.