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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. (See 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 (see Preparing for TeX).