Well, it has <i>bash</i> in the title, so surprise surprise.<p>If it were about detecting failed commands in Unix shells, all it would need to say is "$?", though. That's hardly worth a blog post.<p><a href="http://www.openbsd.org/cgi-bin/man.cgi?query=sh" rel="nofollow">http://www.openbsd.org/cgi-bin/man.cgi?query=sh</a>