Process Accounting

Process accounting allows you to keep track of the following data about each process run on your system: the user and group IDs of those using the process, the beginning and elapsed times of the process, the CPU time for the process (divided between users and the system), the amount of memory used, the commands run, and the controlling tty during the process. Every time a process dies, the exit program collects this data and writes it to the file /var/adm/pacct.