You would have to use an Operations Manager report, powershell script (from Windows) or a unix shell script from a unix server. You can't run a script directly on the filer itself.
If a unix script is to use, what is the least privilege account can be used to ssh to the filer to get the info? I created an account that belongs to Guests role but when login using ssh, it is being denied. Can anyone advise?
You can view the abiliities of a role using the "useradmin role list" command. You may want to create a new role that only contains the needed attributes for the commands you would want to run, then assign that role to a user account.
