Ubuntu - Auditing - Audit a file

WARNING: Please be careful before creating rules.

It will increase your log file size significantly if too much information to record.

Audit file access

sudo auditctl -w /etc/passwd -p rwxa

-w path ; this parameter will insert a watch for the file system object at path. On the example above, auditd will watch the /etc/passwd file.
-p ; this parameter describes the permission access type that a file system watch will trigger on.
rwxa ; are the attributes which bind to -p parameter above. r is read, w is write, x is execute and a is attribute.