Output Record Separator in Ruby

Explains the meaning of Ruby's obscure $, (output field separator) and $\ (output record separator) global variables, sparked by a LinkedIn question about a trailing comma spotted in the Rails source. The default nil value means no separator, but setting these variables lets you generate CSV-like output from the command line without requiring the CSV library. Notes that this mnemonic global variable is deprecated in Ruby 4.0, with the English module alias $OUTPUT_RECORD_SEPARATOR recommended instead for non-one-liner code.

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