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UNIFDEF(1)									       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 undefined -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 significant.

       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 con-
       struction, 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.

       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

4.3 Berkeley Distribution		  April 29, 1985			       UNIFDEF(1)
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