Q: Why are there two ps utilities on my Sun box?

Answer
Historically, SunOS 4.x was based on BSD unix. Solaris 2.x (= SunOS 5.x) was based on SYSV, with a bunch of commands having different syntax and behavior. To ease the transition, the/usr/ucb directory was created to hold the incompatible BSD versions. People who really wanted BSD could put /usr/ucb before /usr in theirPATH.