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 `@setfilename': Set the output file name
 ----------------------------------------
 
   In order to serve as the primary input file for either `makeinfo' or
 TeX, a Texinfo file must contain a line that looks like this:
 
      @setfilename INFO-FILE-NAME
 
   Write the `@setfilename' command at the beginning of a line and
 follow it on the same line by the Info file name.  Do not write anything
 else on the line; anything on the line after the command is considered
 part of the file name, including what would otherwise be a comment.
 
   The Info formatting commands ignore everything written before the
 `@setfilename' line, which is why the very first line of the file (the
 `\input' line) does not show up in the output.
 
   The `@setfilename' line specifies the name of the output file to be
 generated.  This name must be different from the name of the Texinfo
 file.  There are two conventions for choosing the name: you can either
 remove the extension (such as `.texi') entirely from the input file
 name, or, preferably, replace it with the `.info' extension.
 
   Although an explicit `.info' extension is preferable, some operating
 systems cannot handle long file names.  You can run into a problem even
 when the file name you specify is itself short enough.  This occurs
 because the Info formatters split a long Info file into short indirect
 subfiles, and name them by appending `-1', `-2', ..., `-10', `-11', and
 so on, to the original file name.  ( Tag and Split Files.)  The
 subfile name `texinfo.info-10', for example, is too long for old
 systems with a 14-character limit on filenames; so the Info file name
 for this document is `texinfo' rather than `texinfo.info'.  When
 `makeinfo' is running on operating systems such as MS-DOS which impose
 severe limits on file names, it may remove some characters from the
 original file name to leave enough space for the subfile suffix, thus
 producing files named `texin-10', `gcc.i12', etc.
 
   When producing HTML output, `makeinfo' will replace any extension
 with `html', or add `.html' if the given name has no extension.
 
   The `@setfilename' line produces no output when you typeset a manual
 with TeX, but it is nevertheless essential: it opens the index,
 cross-reference, and other auxiliary files used by Texinfo, and also
 reads `texinfo.cnf' if that file is present on your system (
 Preparing for TeX Preparing for TeX.).
 
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