unifdef man page on NeXTSTEP

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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 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.

       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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