How to get list of user who have only ITIL role?

[Santosh Kallim1]

Hello Experts,

I have 20K user's, there multiple roles added to each user's

There are some user's, only have ITIL role, there are no roles added to these users except ITIL, so I need to get the count of those users and sys_id through scripting, 

can anybody help me please? 

[Bhujangi Gawal1]

help me above questions