returns the line number of the final line in the program if you omit n, or returns the nth line in the program if you specify n. If specified, n must be a positive whole number and must not exceed the number of the final line in the program.>>-SOURCELINE--(--+---+--)------------------------------------->< '-n-'
SOURCELINE() -> 10
SOURCELINE(1) -> '/* This is a 10-line REXX program */'