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May 21st, 2018
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  1. # Ruby $_ ans single quote.
  2.  
  3. echo "hi"
  4. seq 2 > 20180516_Wednesday/seq
  5. ruby -ne "print $_" 20180516_Wednesday/seq
  6. ruby -ne "print " 20180516_Wednesday/seq
  7. ruby -ne 'print $_' 20180516_Wednesday/seq
  8.  
  9. seq 200 > 20180516_Wednesday/seq
  10. ruby -ne 'print if /15$/' 20180516_Wednesday/seq
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