~/.bash_history will show the commands that was used by a user.
Install acct : sudo apt-get install acct in addition to login/logout. It provides logs of every single command run by every single user. Below mentioned commands are the features of acct
acprint statistics about connect timeacctonturns accounting on or offlastlist last logins of users and termslastcommlist last commands executedsaprint accounting statisticsdump-acctprint accounting file in human-readable form
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https://launchpad.net/ubuntu/precise/+source/activity-log-manager/0.9.4-0ubuntu3.2
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