tar: Keep Old Files

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1 Keep Old Files
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1 GNU 'tar' provides two options to control its actions in a situation
1 when it is about to extract a file which already exists on disk.
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1 '--keep-old-files'
1 '-k'
1      Do not replace existing files from archive.  When such a file is
1      encountered, 'tar' issues an error message.  Upon end of
1      extraction, 'tar' exits with code 2 (⇒exit status).
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1 '--skip-old-files'
1      Do not replace existing files from archive, but do not treat that
1      as error.  Such files are silently skipped and do not affect 'tar'
1      exit status.
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1      Additional verbosity can be obtained using
11      '--warning=existing-file' together with that option (⇒
      warnings).
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