# ifnames(1) - man - phpMan

[IFNAMES(1)](https://www.chedong.com/phpMan.php/man/IFNAMES/1/markdown)                                  User Commands                                 [IFNAMES(1)](https://www.chedong.com/phpMan.php/man/IFNAMES/1/markdown)



## 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 identifiers 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: <<https://www.gnu.org/software/autoconf/>>.
       General help using GNU software: <<https://www.gnu.org/gethelp/>>.

## COPYRIGHT
       Copyright © 2021 Free Software Foundation, Inc.  License GPLv3+/Autoconf: GNU GPL  version  3
       or later <<https://gnu.org/licenses/gpl.html>>, <<https://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)](https://www.chedong.com/phpMan.php/man/autoconf/1/markdown), [**automake**(1)](https://www.chedong.com/phpMan.php/man/automake/1/markdown),  [**autoreconf**(1)](https://www.chedong.com/phpMan.php/man/autoreconf/1/markdown),  [**autoupdate**(1)](https://www.chedong.com/phpMan.php/man/autoupdate/1/markdown),  [**autoheader**(1)](https://www.chedong.com/phpMan.php/man/autoheader/1/markdown),  [**autoscan**(1)](https://www.chedong.com/phpMan.php/man/autoscan/1/markdown),  **con**‐‐
       [**fig.guess**(1)](https://www.chedong.com/phpMan.php/man/fig.guess/1/markdown), [**config.sub**(1)](https://www.chedong.com/phpMan.php/man/config.sub/1/markdown), [**ifnames**(1)](https://www.chedong.com/phpMan.php/man/ifnames/1/markdown), [**libtool**(1)](https://www.chedong.com/phpMan.php/man/libtool/1/markdown).

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

              **info** **ifnames**

       should give you access to the complete manual.



GNU Autoconf 2.71                            August 2021                                  [IFNAMES(1)](https://www.chedong.com/phpMan.php/man/IFNAMES/1/markdown)