version of OS

How to know the whether the system in IBM-AIX, or HP-UX or Sun Solaris?
I have typed command "version" at the prompt and i got
machine hardware: sun4us
OS version:5.9
and more....
So is my system Sun Solaris

Please let me know how can i find the OS

$ uname -a

usually gives you all the information you need.

Yes, correct...

If you need more information, type the below.

#machinfo

-DB