UUUUNNNNIIIIFFFFDDDDEEEEFFFF((((1111))))               UUUUNNNNIIIIXXXX 5555....0000 ((((RRRRaaaannnndddd))))               UUUUNNNNIIIIFFFFDDDDEEEEFFFF((((1111))))



     NNNNAAAAMMMMEEEE
          unifdef - remove ifdef'ed lines

     SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
          uuuunnnniiiiffffddddeeeeffff [ ----tttt ----llll ----cccc ----dddd_s_y_m ----uuuu_s_y_m ----iiiidddd_s_y_m ----iiiiuuuu_s_y_m ] ...  [ file ]

     DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
          _U_n_i_f_d_e_f is useful for removing ifdef'ed lines from a file
          while otherwise leaving the file alone.  _U_n_i_f_d_e_f 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 (----dddd_s_y_m) or
          undefined (----uuuu_s_y_m) 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 _s_y_m will also
          be removed.  Ifdefs involving symbols you don't specify and
          ``#if'' control lines 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 ----llll option causes _u_n_i_f_d_e_f 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
          _u_n_i_f_d_e_f 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 ----iiiidddd_s_y_m and ----iiiiuuuu_s_y_m
          similar to ----dddd_s_y_m and ----uuuu_s_y_m above.

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

          _U_n_i_f_d_e_f copies its output to _s_t_d_o_u_t and will take its input
          from _s_t_d_i_n if no _f_i_l_e argument is given.  If the ----cccc argument
          is specified, then the operation of _u_n_i_f_d_e_f is complemented,
          i.e. the lines that would have been removed or blanked are
          retained and vice versa.

          _U_n_i_f_d_e_f works nicely with the ----iiii_s_y_m option recently added to
          _d_i_f_f at Rand.

     SSSSEEEEEEEE AAAALLLLSSSSOOOO



     PPPPaaaaggggeeee 1111                                          ((((pppprrrriiiinnnntttteeeedddd 7777////22227777////88886666))))






     UUUUNNNNIIIIFFFFDDDDEEEEFFFF((((1111))))               UUUUNNNNIIIIXXXX 5555....0000 ((((RRRRaaaannnndddd))))               UUUUNNNNIIIIFFFFDDDDEEEEFFFF((((1111))))



          diff(1)

     DDDDIIIIAAAAGGGGNNNNOOOOSSSSTTTTIIIICCCCSSSS
          Premature EOF, inappropriate else or endif.

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

     AAAAUUUUTTTTHHHHOOOORRRR
          Dave Yost, The Rand Corporation

     BBBBUUUUGGGGSSSS
          Should try to deal with ``#if'' lines.










































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