The cited filename is passed as argv[1] If the filename is "-i" then the command is "/bin/sh -i" This forces an interactive shell. Hence the important of not invoking it as "./-i" -a -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://minnie.tuhs.org/pipermail/tuhs/attachments/20190804/89f28300/attachment.html>