(diff.info.gz) Unified Format

 
 Unified Format
 --------------
 
    The unified output format is a variation on the context format that
 is more compact because it omits redundant context lines.  To select
 this output format, use the `-U LINES', `--unified[=LINES]', or `-u'
 option.  The argument LINES is the number of lines of context to show.
 When it is not given, it defaults to three.
 
    At present, only GNU `diff' can produce this format and only GNU
 `patch' can automatically apply diffs in this format.  For proper
 operation, `patch' typically needs at least three lines of context.
(diff.info.gz) Unified Format

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