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 ALSOdiff(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)