# 2.11BSD#431 - /usr/man/cat1/unifdef.0

    UNIFDEF(1)	    UNIX Programmer's Manual	       UNIFDEF(1)

    NAME
         unifdef - remove ifdef'ed lines

    SYNOPSIS
         unifdef [ -t -l -c -Dsym -Usym -idsym -iusym ] ...  [ file ]

    DESCRIPTION
         Unifdef is useful for removing ifdef'ed lines from a file
         while otherwise leaving the file alone.  Unifdef is like a
         stripped-down C preprocessor: it is smart enough to deal
         with the nested ifdefs, comments, single and double quotes
         of C syntax so that it can do its job, but it doesn't do any
         including or interpretation of macros.  Neither does it
         strip out comments, though it recognizes and ignores them.
         You specify which symbols you want defined -Dsym or unde-
         fined -Usym and the lines inside those ifdefs will be copied
         to the output or removed as appropriate.  The ifdef, ifndef,
         else, and endif lines associated with sym will also be
         removed.  Ifdefs involving symbols you don't specify are
         untouched and copied out along with their associated ifdef,
         else, and endif lines.  If an ifdef X occurs nested inside
         another ifdef X, then the inside ifdef is treated as if it
         were an unrecognized symbol.  If the same symbol appears in
         more than one argument, only the first occurrence is signi-
         ficant.

         The -l option causes unifdef to replace removed lines with
         blank lines instead of deleting them.

         If you use ifdefs to delimit non-C lines, such as comments
         or code which is under construction, then you must tell
         unifdef which symbols are used for that purpose so that it
         won't try to parse for quotes and comments in those ifdef'ed
         lines.  You specify that you want the lines inside certain
         ifdefs to be ignored but copied out with -idsym and -iusym
         similar to -Dsym and -Usym above.

         If you want to use unifdef for plain text (not C code), use
         the -t option.  This makes unifdef refrain from attempting
         to recognize comments and single and double quotes.

         Unifdef copies its output to stdout and will take its input
         from stdin if no file argument is given.  If the -c argument
         is specified, then the operation of unifdef is complemented,
         i.e. the lines that would have been removed or blanked are
         retained and vice versa.

    SEE ALSO
         diff(1)

    DIAGNOSTICS
         Premature EOF, inappropriate else or endif.

    Printed 11/26/99	 April 29, 1985                         1

    UNIFDEF(1)	    UNIX Programmer's Manual	       UNIFDEF(1)

         Exit status is 0 if output is exact copy of input, 1 if not,
         2 if trouble.

    BUGS
         Does not know how to deal with cpp consructs such as

    	  #if  defined(X) || defined(Y)

    AUTHOR
         Dave Yost

    Printed 11/26/99	 April 29, 1985                         2

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