Cisco IOS tclsh oneliner to configure vrf on interface

Example:
ios_config "int Et0/0" "ip vrf for VPNA" [exec "sh run int Et0/0 | i addr"]

More advanced stuff:
foreach i {
Et0/0.10
Et0/0.20
Et0/0.33
Tu1
s1/0
} { ios_config "int $i" "ip vrf for VPNA" [exec "sh run int $i | i addr"] }