hi,
If u want to create the tablespaces by the script u have created then

At svrmgrl>connect internal

svrmgrl>@/dorothystuff/orascript/cretablspc/nebraska/Idaho_potato.log

or else

svrmgrl>sta /dorothystuff/orascript/cretablspc/nebraska/Idaho_potato.log


Cheers,
Vinod Kumar.