sunos man page for ifnames

IFNAMES(1)                                                         User Commands                                                        IFNAMES(1)

NAME
       ifnames - Extract CPP conditionals from a set of files

SYNOPSIS
       ifnames [OPTION]... [FILE]...

DESCRIPTION
       Scan all of the C source FILES (or the standard input, if none are given) and write to the standard output a sorted list of all the identi-
       fiers that appear in those files in `#if', `#elif', `#ifdef', or `#ifndef' directives.  Print each identifier on  a  line,  followed  by  a
       space-separated list of the files in which that identifier occurs.

       -h, --help
              print this help, then exit

       -V, --version
              print version number, then exit

AUTHOR
       Written by David J. MacKenzie and Paul Eggert.

REPORTING BUGS
       Report bugs to <bug-autoconf@gnu.org>.
       GNU Autoconf home page: <http://www.gnu.org/software/autoconf/>.
       General help using GNU software: <http://www.gnu.org/gethelp/>.

COPYRIGHT
       Copyright  (C) 2012 Free Software Foundation, Inc.  License GPLv3+/Autoconf: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>,
       <http://gnu.org/licenses/exceptions.html>
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       autoconf(1), automake(1), autoreconf(1), autoupdate(1), autoheader(1), autoscan(1), config.guess(1), config.sub(1), ifnames(1), libtool(1).

       The full documentation for ifnames is maintained as a Texinfo manual.  If the info and ifnames programs  are  properly  installed  at  your
       site, the command

              info ifnames

       should give you access to the complete manual.

GNU Autoconf 2.69                                                   August 2017                                                         IFNAMES(1)