GNU Info

(latex.info)\typeout

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Enter node , (file) or (file)node

\typeout
--------

   `\typeout{msg}'

   Prints `msg' on the terminal and in the `log' file.  Commands in
`msg' that are defined with `\newcommand' or `\renewcommand' are
replaced by their definitions before being printed.

   LaTeX's usual rules for treating multiple spaces as a single space
and ignoring spaces after a command name apply to `msg'.  A `\space'
command in `msg' causes a single space to be printed. A `^^J' in `msg'
prints a newline.