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This is similar to $ ($POSTMATCH ) except that it does not incur the performance penalty associated with that variable, and is only guaranteed to return a defined value when the pattern was compiled or executed with the /p modifier.

IO::Handle->output_record_separator EXPR $OUTPUT_RECORD_SEPARATOR $ORS $$\

The output record separator for the print operator. If defined, this value is printed after the last of prints arguments. Default is undef. (Mnemonic: you set $ instead of adding " " at the end of the print. Also, its just like $/ , but its what you get "back" from Perl.)