skill - is used to send signals to users and process
To halt/stop user1
$ skill -STOP -u user1
To resume already halted user1
$ skill -CONT -u user1
To kill and logout user1
$ skill -KILL -u user1
To kill and logout all users
$ skill -KILL -v /dev/pts/*
To stop 3 users user1, user2, user3
$ skill -STOP user1 user2 user3
regards,
T.Dhanasekar