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   patch.1p    ( 1 )

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Использование в приложениях (Application usage)

The -R option does not work with ed scripts because there is too
       little information to reconstruct the reverse operation.

       The -p option makes it possible to customize a patch file to
       local user directory structures without manually editing the
       patch file. For example, if the filename in the patch file was:

           /curds/whey/src/blurfl/blurfl.c

       Setting -p 0 gives the entire pathname unmodified; -p 1 gives:

           curds/whey/src/blurfl/blurfl.c

       without the leading <slash>, -p 4 gives:

           blurfl/blurfl.c

       and not specifying -p at all gives:

           blurfl.c .