How do I know the version of unix I am on ?

I am reporting on AIX 4 / 5
Solaris 6/7/8/9/10
Rhat 4/5 systems.

what file tell me the actuall version ?  I recall that redhat has something under /etc

TIMFOX123Asked:
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woolmilkporcConnect With a Mentor Commented:
AIX: oslevel -s
RedHat: cat /proc/version
Solaris: cat /etc/release

wmp
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woolmilkporcCommented:
AIX 4: oslevel -r

(oslevel -s from AIX 5L on).
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TIMFOX123Author Commented:
thx, that os one of them :)

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TIMFOX123Author Commented:
great job
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