Name "main::file_one" used only once: possible typo at ./pm_example.pl line 8.
line : qwe
  line2 : rty
 
line : qwe
  line2 : fgh
 
line : qwe
  line2 : vbn
 
line : asd
  line2 : rty
 
line : asd
  line2 : fgh
 
line : asd
  line2 : vbn
 
line : zxc
  line2 : rty
 
line : zxc
  line2 : fgh
 
line : zxc
  line2 : vbn