[arch-general] Set ip lan address /etc/environment

Hi, I put this text in /etc/environment: $ source /etc/environment ip="$(ifconfig | grep -A 1 'eth0' | tail -1 | cut -d ':' -f 2 | cut -d ' ' -f 1)" $ echo $ip 192.168.0.33 Works fine, but when I reboot my archlinux: $ echo $ip $(ifconfig | grep -A 1 'eth0' | tail -1 | cut -d ':' -f 2 | cut -d ' ' -f 1) What's happened?? Is necessary exec source /etc/environment after every reboot? Thanks in advanced.