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(latex.info)\typein

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Next: \typeout Up: Terminal Input/Output

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\typein
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   `\typein[cmd]{msg}'

   Prints `msg' on the terminal and causes LaTeX to stop and wait for
you to type a line of input, ending with return.  If the `cmd' argument
is missing, the typed input is processed as if it had been included in
the input file in place of the `\typein' command.  If the `cmd'
argument is present, it must be a command name.  This command name is
then defined or redefined to be the typed input.