UNIFDEF(1,C)                AIX Commands Reference                 UNIFDEF(1,C)



-------------------------------------------------------------------------------
unifdef



PURPOSE

Removes "ifdef'ed" lines.

SYNTAX


           +--------------+   +--------+
unifdef ---| +----------+ |---|        |---|
           +-| -c idsym |-+   +- file -+
            ^| -l iusym ||
            || -t       ||
            || Dsym     ||
            || Usym     ||
            |+----------+|
            +------------+


DESCRIPTION

The unifdef command is useful for removing ifdef'ed lines from a file while
otherwise leaving the file alone.  The command 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 are
copied to the output or removed as appropriate.  The ifdef, ifndef, else, and
endif lines associated with sym are 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 the unifdef command for plain text (not C code), use the -t
option.  This makes unifdef refrain from attempting to recognize comments and
single and double quotes.



Processed November 8, 1990       UNIFDEF(1,C)                                 1

UNIFDEF(1,C)                AIX Commands Reference                 UNIFDEF(1,C)




The unifdef command copies its output to stdout and takes its input from stdin
if no file argument is given.  If the -c argument is specified, then the
operation of unifdef is complemented, for example the lines that would have
been removed or blanked are retained and vice versa.

RELATED INFORMATION

See the following command:  "diff."














































Processed November 8, 1990       UNIFDEF(1,C)                                 2