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