Unified Format

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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 two lines of context.

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