From: Joel Pearson Date: 2012-08-29T04:06:25+09:00 Subject: Re: Is calling system() from a thread suppose to be safe? Can you add a line which puts the cmd value out before triggering the system command and report it back? It still looks like the only way to get that error in this code is to pass something invalid to system. -- Posted via http://www.ruby-forum.com/.