ifconfigのIPだけ引っこ抜きたい

ifconfig | grep "inet addr:" | grep -v "127.0.0.1" | sed -e "s/^ *inet addr:\([^ ]\+\).*$/\1/g"

一個だけ欲しい人は↓

ifconfig | grep "inet addr:" | grep -v "127.0.0.1" | sed -e "s/^ *inet addr:\([^ ]\+\).*$/\1/g"| head -n1