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in reply to Re^4: One liner to subtract by 2
in thread One liner to subtract by 2

This outputs the new contents to the standard output. If you want to change the file, you have to add the -i flag:
perl -i~ -pe ...
لսႽ ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ