Reversing the order of lines in a file
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Author: Momchil Ivanov <momchil@xaxo.eu>
Date  : 2013.01.19

Using tail
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  tail -r

Using sed
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  # reverse order of lines (emulates "tac")
  # bug/feature in HHsed v1.5 causes blank lines to be deleted
  sed '1!G;h;$!d'               # method 1
  sed -n '1!G;h;$p'             # method 2

Additional information
----------------------

   For additional information see:

     http://stackoverflow.com/questions/742466/how-can-i-reverse-the-order-of-lines-in-a-file

   or search for "sed1line.txt".