Monster was developed on VMS TinyMUD was developed on BSD Unix and very heavily inspired by Monster BSD Unix used the A SHell or ASH not the Bourne Shell Regardless the Bourne shell commentary would be incorrect since neither link unlink chown have anything whatever to do with what shell you are running They happen to be Unix commands not shell builtins I would be hard pressed to make the case that Monster Link Unlink are inspired by VMS commands since LINK is the command to invoke the linkage editor ld on Unix and there is no Unlink TinyMud s chown is clearly inspired by the Unix command I really don t understand the significance of pointing out the obvious origins of a single TinyMUD command