sudo apt-get install auditd
This will install some tools related to auditd tool. Here are the tools:
auditctl ; is a tool to control the behaviour of the daemon on the fly, adding rules, etc.
/etc/audit/audit.rules ; is the file that contains audit rules.
aureport ; is tool to generate and view the audit report.
ausearch ; is a tool to search various events.
auditspd ; is a tool which can be used to relay event notifications to other applications instead of writing them to disk in the audit log.
autrace ; is a command that can be used to trace a process.
/etc/audit/auditd.conf ; is the configuration file of auditd tool.