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$ cat pm_1199549_test_file.txt
2017-08-01 20MICRONS 37744
2016-08-01 20MICRONS 25966
2016-04-20 20MICRONS 30807
2016-04-01 20MICRONS 32780

$ perl -e 'local $/; @x = <>; use Data::Dump; dd \@x' pm_1199549_test_
+file.txt
[
  "2017-08-01 20MICRONS 37744\n2016-08-01 20MICRONS 25966\n2016-04-20 
+20MICRONS 30807\n2016-04-01 20MICRONS 32780\n",
]

$ perl -e '{ local $/; } @x = <>; use Data::Dump; dd \@x' pm_1199549_t
+est_file.txt
[
...
  "2016-04-20 20MICRONS 30807\n",
  "2016-04-01 20MICRONS 32780\n",
]