(diff.info.gz) Detailed If-then-else

(diff.info.gz) Example If-then-else

 
 Detailed Description of If-then-else Format
 -------------------------------------------
 
    For lines common to both files, `diff' uses the unchanged line group
 format.  For each hunk of differences in the merged output format, if
 the hunk contains only lines from the first file, `diff' uses the old
 line group format; if the hunk contains only lines from the second
 file, `diff' uses the new group format; otherwise, `diff' uses the
 changed group format.
 
    The old, new, and unchanged line formats specify the output format of
 lines from the first file, lines from the second file, and lines common
 to both files, respectively.
 
    The option `--ifdef=NAME' is equivalent to the following sequence of
 options using shell syntax:
 
      --old-group-format='#ifndef NAME
      %<#endif /* ! NAME */
      ' \
      --new-group-format='#ifdef NAME
      %>#endif /* NAME */
      ' \
      --unchanged-group-format='%=' \
      --changed-group-format='#ifndef NAME
      %<#else /* NAME */
      %>#endif /* NAME */
      '
 
    You should carefully check the `diff' output for proper nesting.
 For example, when using the `-D NAME' or `--ifdef=NAME' option, you
 should check that if the differing lines contain any of the C
 preprocessor directives `#ifdef', `#ifndef', `#else', `#elif', or
 `#endif', they are nested properly and match.  If they don't, you must
 make corrections manually.  It is a good idea to carefully check the
 resulting code anyway to make sure that it really does what you want it
 to; depending on how the input files were produced, the output might
 contain duplicate or otherwise incorrect code.
 
    The `patch' `-D NAME' option behaves like the `diff' `-D NAME'
 option, except it operates on a file and a diff to produce a merged
 file;  patch Options.

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(diff.info.gz) If-then-else

(diff.info.gz) Example If-then-else

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