You usually don't access the file sulogin at all since it is a binary used for the login when you boot in single user mode. Found it on my Debian box and also the man page for it.
If you want to see any readable stuff from the sulogin binary, use
strings /sbin/sulogin
But I seriously doubt you get something useful out of it.
I don't know either what it has to do with EEPROM.
EEPROM security is a hardware function. Try the hardware manual.
IRIX is an operating system.
Google "Irix manual" found one easily, but there are different versions.