$ echo "ip vrf forwarding ABC:Defgh
ip address 1.1.1.1 255.255.255.252
ip vrf forwarding ABD: Efghi
ip address 2.2.2.2 255.255.255.252" | perl -pe'$_ .= $_ if /^ip address/'
ip vrf forwarding ABC:Defgh
ip address 1.1.1.1 255.255.255.252
ip address 1.1.1.1 255.255.255.252
ip vrf forwarding ABD: Efghi
ip address 2.2.2.2 255.255.255.252
ip address 2.2.2.2 255.255.255.252