Task: How to halt/stop user called didi
Type the skill command as follows:
# skill -STOP -u didi
You muse be root to stop other users.
Task: How to resume already halted user called didi
Send CONT single to user didi, type the following command:
# skill -CONT -u didi
Task: How to kill and logout user called didi
You can send KILL single, type the following command:
# skill -KILL -u didi
Task: Kill and logout all users
The ultimate command to kill and logout all users, type the following command:
# skill -KILL -v /dev/pts/*
Please note that send users warning message or logout notice using wall command to avoid data loss.