Showing All nics with link using bash

 # for i in $(cat /proc/net/dev | grep ':' | cut -d ':' -f 1); do echo "Interface : $i" "  $(ethtool $i | grep Link)"; done
Interface : lo          Link detected: yes
Interface : virbr0-nic          Link detected: no
Interface : virbr0      Link detected: no
Interface : em1         Link detected: no
Interface : wlan0       Link detected: yes