There currently is a patch for adding '-S' to OpenBSD and in the discussion, the one who came originally up with it commented on how he added it to FreeBSD: "I

There currently is a patch for adding '-S' to OpenBSD and in the discussion, the one who came originally up with it commented on how he added it to FreeBSD: "IIRC, the catalyst for it was that early FreeBSD (1990's?) did split up the words on the '#!' line because that seemed convenient. Years later, someone else noticed that this behavior did not match '#!' processing on any other unix, so they changed the behavior so it would match. Someone else then thought that was a bug, because they had scripts which depended on the earlier behavior. I forget how many times the behavior of '#!' processing bounced back and forth, but I had some scripts which ran on multiple versions of Unix and one of these commits broke one of those scripts. I read up on all the commit-log history, and fixed '#!' processing one more time so that it matched how other unixes do it, and I think I also left comments in the code for that processing to document that "Yes, '#!'-parsing is really supposed to work this way". And then in an effort to help those people who depended on the earlier behavior, I implemented '-S' to the 'env' command. I have no idea how much '-S' is used, but it's been in FreeBSD since June 2005, and somewhere along the line those changes were picked up by MacOS 10. The only linux I work on is RHEL, and it looks like Redhat added '-S' between RHEL7 and RHEL8." [https://marc.info/?l=openbsd-tech&m=175307781323403&w=2 https://marc.info/?l=openbsd-tech&m=175307781323403&w=2]