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IFDEF(1)                    General Commands Manual                   IFDEF(1)

NAME
       ifdef - remove #ifdefs from a file

SYNOPSIS
       ifdef [-t] [-dsymbol] [-Dsymbol] [-Usymbol] [-Isymbol] [file]

OPTIONS
       -D   # Define symbol permanently

       -I   # Ignore symbol

       -U   # Undefine symbol permanently

       -d   # Define symbol. It may be #undef'ed later

       -t   # Produce a table of the symbols on stdout

EXAMPLES
       ifdef -DUNIX file.c >newfile.c
                           # Define UNIX

       ifdef -D_MINIX -UDOS <x.c >y.c
                           # Define _MINIX, undefine DOS

DESCRIPTION
       Ifdef  allows  conditional code [ #ifdef ... #endif ] to be selectively
       removed from C files,  but  at  the  same  time  leaving  all  other  C
       preprocessor  commands  intact such as #define, #include etc.  Input to
       ifdef is either the file named as the last argument,  or  stdin  if  no
       file is named.  Output goes to stdout.

       Symbols  may  be  defined with the -d or -D flags just like cpp, except
       that the latter option ignores subsequent #undefs.  It is not permitted
       to  give  values  to  symbols.   Similarly,  -U  undefines a symbol and
       ignores subsequent #definess.  Symbols defined with -I are ignored; any
       #ifdef using an ignored symbol will be left intact.

                                                                      IFDEF(1)
NAME | SYNOPSIS | OPTIONS | EXAMPLES | DESCRIPTION