Show interface speed and duplex as a list

If you need a list of interfaces and the actual speed and duplex settings use this:

# ifconfig -a | grep encap | awk '{print $1}' | grep -v lo | grep -v bond | grep -v ":" \
| grep -v ^lo | xargs -I % sh -c 'ethtool %; ethtool -i %' | grep '^driver\|Speed\|Duplex\|Setting' \
| sed "s/^/ /g" | tr -d "\t" | tr -d "\n" | sed "s/Settings for/\nSettings for/g" \
| awk '{print $5 " "$7 "\t " $9 "\t" $3}' | grep -v "Unknown" | grep -v "\."

Found here: https://community.checkpoint.com/thread/7056-interface-speed-and-duplex-as-list