[root@ecs-meeting-usg-smn-proxy ~]# cat ip.txt
1.1.1.1
[root@ecs-meeting-usg-smn-proxy ~]#
[root@ecs-meeting-usg-smn-proxy ~]# read   -p "Input your password:" ip   < ip.txt
[root@ecs-meeting-usg-smn-proxy ~]# echo ip
ip
[root@ecs-meeting-usg-smn-proxy ~]# echo $ip
1.1.1.1