What kind of macline is it? If unix or linux, try: ls -l myFile and let us know what you see. ./myFile there may be a path issue. If windows, ask someone else. Mike. -- Michael D. Berger m.d.berger@xxxxxxxx -----Original Message----- From: hero lp [mailto:herolp@xxxxxxxxx] Sent: Thursday, May 19, 2005 10:15 PM To: Michael D. Berger Subject: Re: how to execute my libipq test program? OK, thanks to your reply. I have followed your instructions step by step. But I get trouble at the last step. That is, when I try to execute my compiled program, there is an error ---- no such command. Why?