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help: Release DHCPv6 lease for interface allowed: local -a array array=( /var/lib/dhcp/dhclient_v6_*.conf ) tail=${array[@]#/var/lib/dhcp/dhclient_v6_} ifnames=${tail[@]%.conf} echo -n ${ifnames[@]} run: sudo /opt/vyatta/sbin/vyatta-dhcpv6-client.pl --release --ifname "$4"