Some variables in Ruby containing $

Ruby comes with a set of predefined variables $: =Default search path (array of paths)

Other Ruby special variables:

$! The location where the last error message [email protected] is generated $ _ gets recently read string $. the number of lines recently read by the interpreter (line number) $ & the last string matching the regular expression $ ~ The Nth subexpression (and ~ [N] Same) $ = case-sensitive flag $/input record delimiter $ \ output record delimiter $0 Ruby script file name $ * command line parameter $ interpreter process ID $? The last sub-process exited