Make sure you specify the full path to ifconfig as well, you will not that solaris has a few versions of it and they have different outputs.

     /sbin/ifconfig interface  [ address_family ]  [  address   [
     dest_address ]  ]  [ up ]  [ down ]  [ auto-revarp ]  [ net-
     mask mask  ]  [ broadcast address  ]  [ metric n  ]  [ mtu n
     ]  [trailers  | -trailers ]  [private  | -private ]  [arp  |
     -arp ]  [ plumb ]  [ unplumb ]

     /usr/sbin/ifconfig interface  [ address_family ]  [  address
     [  dest_address  ]   ]  [ up ]  [ down ]  [ auto-revarp ]  [
     netmask mask  ]  [ broadcast address  ]  [ metric  n   ]   [
     mtu  n   ]  [trailers  | -trailers ]  [private  | -private ]
     [arp  | -arp ]  [ plumb ]  [ unplumb ]

     /sbin/ifconfig interface  {auto-dhcp  | dhcp }  [ primary  ]
     [ wait seconds  ] drop  | extend  | ping  | release  | start
     | status

     /usr/sbin/ifconfig interface  {auto-dhcp  | dhcp }   [  pri-
     mary  ]  [ wait seconds  ] drop  | extend  | ping  | release
     | start  | status
[download]

-Waswas