I have a quite fresh install of the Apache (2.2.3/Centos) + PHP(5.1.6) and following problem: I need to monitor life of one process and in order to do that I run: $last_line = exec('ps -C snmpd'); and check its output. Unfortunately I always get nothing. I've checked it with other process names and it seems it can 'see' only Apache's processes. Any idea how to work this out?