sa

Display executable invocations per user

$ sudo sa

$ sudo sa --print-users

$ sudo sa --user-summary

sa [options] [file]

sa summarizes accounting information about commands executed by users. It reports CPU time spent, I/O operations, and other resource usage from process accounting data.
Part of the acct package, it requires process accounting to be enabled for data collection.

--print-users

Show responsible usernames

Display per-user resource summary

Requires process accounting to be enabled (accton). Historical data depends on accounting file rotation.

Part of acct (process accounting) package, providing system-wide command usage statistics.

lastcomm(1), accton(8), ac(1)