I don't remember exactly how I searched for it, but the top hit on Google for "haskell argv[0]" today is https://ghc.haskell.org/trac/ghc/ticket/3199 https://gh

I don't remember exactly how I searched for it, but the top hit on Google for "haskell argv[0]" today is https://ghc.haskell.org/trac/ghc/ticket/3199 https://ghc.haskell.org/trac/ghc/ticket/3199, which is marked "wontfix" and includes a workaround (which I used). The second link is to Environment.hs, which would have solved my problem, if I'd known what I was looking for. I think I'd have just clicked Back when I saw it was library source code, though. The third link is http://hackage.haskell.org/package/system-argv0-0.1 http://hackage.haskell.org/package/system-argv0-0.1 - which says "Use this instead of System.Environment.getProgName if you want the full path, and not just the last component." (note: technically, my code was still the correct solution, since 0install targets Ubuntu 12.04, but yes ideally I would have found that newer versions did support it more simply)