Where does Solaris write logs when installing packages?

Question

*nix-like systems

Actually the question is in the topic, you need to find the log file where it writes when installing packages.

Answer 1

Actually the question is in the topic,

Actually, asking a question "in the subject" ;-), you should at least give yourself the trouble to write what Solaris name is, because Solaris 9/10 and OpenSolaris/Solaris 11 are completely different package systems.