'exit(1);' considered useless (slight flame)

[Mark Horton]

Of course, perror is not enough.  One of my favorite error messages
happens when a new user sits down to edit a file, and types the name
of the file.  The shell comes back with
	file: permission denied
which makes them think they don't have access to the file.  What
really happened is that they forgot to type "vi".