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Test Your Knowledge in Computers #525
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In ASCII, to convert between uppercase and lowercase versions, you only need to invert the second bit (0 for uppercase, 1 for lowercase).
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unifdef(1) [bsd man page]

UNIFDEF(1)						      General Commands Manual							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 pre- processor: 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 com- ments 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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unifdef(1)							   User Commands							unifdef(1)

NAME
unifdef - resolve and remove ifdef'ed lines from C program source SYNOPSIS
unifdef [-clt] [-Dname] [-Uname] [-iDname] [-iUname] ... [filename] DESCRIPTION
unifdef removes ifdefed lines from a file while otherwise leaving the file alone. It is smart enough to deal with the nested ifdefs, com- ments, single and double quotes of C syntax, but it does not do any including or interpretation of macros. Neither does it strip out com- ments, though it recognizes and ignores them. You specify which symbols you want defined with -D options, and which you want undefined with -U options. Lines within those ifdefs will be copied to the output, or removed, as appropriate. Any ifdef, ifndef, else, and endif lines associated with filename will also be removed. ifdefs involving symbols you do not specify are untouched and copied out along with their associated ifdef, else, and endiff1 lines. If an ifdefX occurs nested inside another ifdefX, 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. unifdef copies its output to the standard output and will take its input from the standard input if no filename argument is given. OPTIONS
The following options are supported: -c Complement the normal operation. Lines that would have been removed or blanked are retained, and vice versa. -l Replace ``lines removed'' lines with blank lines. -t Plain text option. unifdef refrains from attempting to recognize comments and single and double quotes. -Dname Lines associated with the defined symbol name. -Uname Lines associated with the undefined symbol name. -iDname Ignore, but print out, lines associated with the defined symbol name. 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 will not try to parse for quotes and comments within them. -iUname Ignore, but print out, lines associated with the undefined symbol name. EXIT STATUS
The following exit values are returned: 0 Successful operation. 1 Operation failed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWbtool | +-----------------------------+-----------------------------+ SEE ALSO
diff(1), attributes(5) DIAGNOSTICS
Premature EOF Inappropriate else or endif. SunOS 5.11 14 Jan 1992 unifdef(1)

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