$\ - Perldoc Browser

#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 print's arguments. Default is undef.

You cannot call output_record_separator() on a handle, only as a static method. See IO::Handle.

Mnemonic: you set $\ instead of adding "\n" at the end of the print. Also, it's just like $/, but it's what you get "back" from Perl.

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