(command.CommandList children: [ (C {(set)} {(-e)}) (C {(cd)} { (DQ (word_part.CommandSubPart command_list: (command.CommandList children: [(C {(dirname)} {(DQ ($ VSub_Number '$0'))})] ) left_token: <Left_CommandSub '$('> spids: [19 25] ) (/..) ) } ) (C {(script/update)}) (command.AndOr ops: [Op_DAmp] children: [ (C {(test)} {(-z)} {(DQ ($ VSub_DollarName '$RACK_ENV'))}) (command.Assignment keyword: Assign_None pairs: [ (assign_pair lhs: (lhs_expr.LhsName name:RACK_ENV spids:[47]) op: Equal rhs: {(SQ <development>)} spids: [47] ) ] spids: [47] ) ] ) (C {(foreman)} {(start)} {(-p)} {(9393)}) ] )