linux普通用户关机

1. login in as root, creat a new user named "poweroff", with a primary group "poweroff".

2. run "visudo", add the following line in the last:

%poweroff ALL=(root)NOPASSWD:/sbin/shutdown

3. su poweroff, edit ~/.bashrc file and add the following line in it:

sudo shutdown -h now

4. now when you su to user "poweroff", the server will shutdown immediately.

Reference: http://www.ma.utexas.edu/users/stirling/computergeek/shutdown.html