Hm, "SunOS 5.6" aka "Solaris 2.6".
This is Solaris 2.6. Only "uname" tells it is SunOS, that's a historical ueberbleibsel :-)
The system "signature" is "sparc/sun/solaris2.6" whereas the uname command calls it "SunOS". But probably "Solaris" would be the better description ;-)
Yep :-)
SunOS was BSDish, Solaris is much more SYSV-like. The change was done from SunOS 1.x ("SunOS") to SunOS 2.x (Solaris x).
Regards Götz