zshrc: updating bk()
authorMoviuro <moviuro+grml@gmail.com>
Mon, 15 Dec 2014 09:04:35 +0000 (10:04 +0100)
committerFrank Terbeck <ft@grml.org>
Mon, 15 Dec 2014 21:07:10 +0000 (22:07 +0100)
  * using fully POSIX date on all OSes
  * the former openbsd command becomes the fallback solution


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