Getting closer! $ cc -c s *.o $ ./s Makefile ./s: cannot execute $ ls -l s -rw-rw-r-- 1 dmr 61644 Apr 23 11:06 s $ chmod +x s $ ./s usage: s file $ ./s Makefile Memory fault - core dumped -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://minnie.tuhs.org/pipermail/tuhs/attachments/20200424/c0369a8a/attachment.html>