Problem
1. List from /etc/passwd the UID and the user having the highest UID.
2. You have two files, foo1 and foo2, copied from /etc/passwd on two machines. Specify the steps needed to print a list of users who are
(i) present in foo1 but not in foo2,
(ii) present in foo2 and not in foo1,
(iii) present in both files.
3. Assuming that a user may be logged in more than once, how do you
(i) list only those users,
(ii) mail root a sorted list of all users currently logged in, where a user is listed only once?