1UNIFDEF(1) General Commands Manual UNIFDEF(1)
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6 unifdef - remove ifdef'ed lines
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9 unifdef [ -t -l -c -Dsym -Usym -idsym -iusym ] ... [ file ]
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12 Unifdef is useful for removing ifdef'ed lines from a file while other‐
13 wise leaving the file alone. Unifdef is like a stripped-down C pre‐
14 processor: it is smart enough to deal with the nested ifdefs, comments,
15 single and double quotes of C syntax so that it can do its job, but it
16 doesn't do any including or interpretation of macros. Neither does it
17 strip out comments, though it recognizes and ignores them. You specify
18 which symbols you want defined -Dsym or undefined -Usym and the lines
19 inside those ifdefs will be copied to the output or removed as appro‐
20 priate. The ifdef, ifndef, else, and endif lines associated with sym
21 will also be removed. Ifdefs involving symbols you don't specify are
22 untouched and copied out along with their associated ifdef, else, and
23 endif lines. If an ifdef X occurs nested inside another ifdef X, then
24 the inside ifdef is treated as if it were an unrecognized symbol. If
25 the same symbol appears in more than one argument, only the first
26 occurrence is significant.
27 The -l option causes unifdef to replace removed lines with blank lines
29 instead of deleting them.
30 If you use ifdefs to delimit non-C lines, such as comments or code
32 which is under construction, then you must tell unifdef which symbols
33 are used for that purpose so that it won't try to parse for quotes and
34 comments in those ifdef'ed lines. You specify that you want the lines
35 inside certain ifdefs to be ignored but copied out with -idsym and
36 -iusym similar to -Dsym and -Usym above.
37 If you want to use unifdef for plain text (not C code), use the -t
39 option. This makes unifdef refrain from attempting to recognize com‐
40 ments and single and double quotes.
41 Unifdef copies its output to stdout and will take its input from stdin
43 if no file argument is given. If the -c argument is specified, then
44 the operation of unifdef is complemented, i.e. the lines that would
45 have been removed or blanked are retained and vice versa.
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48 diff(1)
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51 Premature EOF, inappropriate else or endif.
52 Exit status is 0 if output is exact copy of input, 1 if not, 2 if trou‐
54 ble.
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57 Does not know how to deal with cpp consructs such as
58 #if defined(X) || defined(Y)
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63 Dave Yost
644.3 Berkeley Distribution April 29, 1985 UNIFDEF(1)