Mono - Command not found

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http://stackoverflow.com – I'm running mono 2.10 on CentOS 5.5 with Apache 2. I've installed it already, and am running a WCF service on it currently. But I can't do mono -V or mono program.exe, which makes me think I installed it incorrectly. The mono binary is in my /opt/mono/bin/ folder. What can I do? (HowTos)