Register now or log in to join your professional community.
last username will show you the login session of the particular user in the machine
vi /home/username/.bash_history will show you the commands which was executed by the particular user.
You can use history command.
For time stamp export HISTTIMEFORMAT variable.
TO know more on this
To audit specific user command ./bash_history may be useful.
To know more please visit:
http://www.tecmint.com/history-command-examples/