[root@master ~]# yum install upower
[root@master ~]# upower -i /org/freedesktop/UPower/devices/battery_BAT0
[root@master ~]# upower -i /org/freedesktop/UPower/devices/battery_BAT0 | grep percentage
percentage: 12%
[root@master ~]# vim .bashrc
[root@master ~]# exec bash
[root@master ~]# b
percentage: 12%
