++ sudo ip a ++ awk '/ 192.0.2.5\//{print $7}' + dev=eth0 + sleep 1 ++ date +%s.%N + echo 'doctor set host down at' 1482894965.164096803 doctor set host down at 1482894965.164096803 + sudo ip link set eth0 down + sleep 180 + sudo ip link set eth0 up + sleep 1