Read only user account
 

Below line is the exact phrase of the task mentioned in my ticket:
Please add 'comsat' user (read only user acct) to the following list of dev servers.

How can I add 'comsat'user with read only access to all the server? What attribute do I need to change in order to make 'comsat' has read only privilege. I know for user ACL not gonna work here.

Thanks in advance.

You need to ask the ticket raiser exactly what they want the comsat user to be able to do.
You can (should) give comsat their own uid AND (exclusive) gid, but after that its really down to protecting other users by making sure they don't add other/world perms.

Read only access to a given app or database is likely more realistic.
Of course if you have an OS that has role-based profiles available, it may be do-able.