>From CentOS /etc/redhat-release: CentOS release 5.2 (Final) >From RHEL3 /etc/redhat-release: Red Hat Enterprise Linux WS release 3 (Taroon Update 9) >From RHEL4 /etc/redhat-release: Red Hat Enterprise Linux WS release 4 (Nahant Update 7) Has anybody maybe actually done this already and can tell if it'd work? What other places may a software look into to check the computer runs the correct OS? JohnStanley Writes: Yes that will work. Replace the appropriate string. Also do cat /etc/issue. One more and it is called programatically "rpm --whatprovides" JohnStanley