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  1. or download this
    qwurx [shmem] ~> time perl -lne 'BEGIN{$,=" "}print+(split)[9,7,5,3,1]
+' in.txt >/dev/null

...
real    0m2.204s
user    0m2.188s
sys    0m0.016s
  2. or download this
    qwurx [shmem] ~> python
Python 2.7.9 (default, Jun 29 2016, 13:08:31) 
...
>>> line.split()[::-2]
['5', '3', '1']
>>> ^D