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(screen.info)Digraph

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Digraph
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 - Command: digraph [preset]
     (none)
     This command prompts the user for a digraph sequence. The next two
     characters typed are looked up in a builtin table and the
     resulting character is inserted in the input stream. For example,
     if the user enters `a"', an a-umlaut will be inserted. If the
     first character entered is a 0 (zero), `screen' will treat the
     following characters (up to three) as an octal number instead.
     The optional argument PRESET is treated as user input, thus one
     can create an "umlaut" key.  For example the command `bindkey ^K
     digraph '"'' enables the user to generate an a-umlaut by typing
     `CTRL-K a'.