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CentOS 7.0 - man page for ifnames (centos section 1)

IFNAMES(1)							   User Commands							IFNAMES(1)

ifnames - Extract CPP conditionals from a set of files
ifnames [OPTION]... [FILE]...
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
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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 2.68b.25-19513 April 2012 IFNAMES(1)