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This silences a useless error message that confuses the user. bsdtar doesn't like it when the stream gets closed before it finishes which may be the case when grep found its match on potentially huge archives. Instead of suppressing the whole stderr , we find all matches with grep, then use a second pass with `tail` to find only the last match, which ensures the stream remains open for bsdtar but we may still catch and see useful messages on stderr. This works because tail has the useful property of not closing early.
