Don't know if this is useful to anyone, but here's a little Perl script that allows you to pass arguments to Chuck separated by spaces rather than colons. Run this and let Perl run Chuck for you with properly formatted arguments. Should be in the same directory as the Chuck file you're trying to run. #!/usr/bin/perl my $args = join(":", @ARGV); $cmd = "chuck YOUR_CHUCK_FILE.ck" . ":$args"; #print "$cmd\n"; exec($cmd); Run with a command something like this: ./arg.pl arg1 arg2 arg3 etc I could imagine something like this being expanded into some sort of on the fly programming front end, to pass arrays of pitches for example.