(command.CommandList children: [ (C {<_Dbg_help_add_sub>} {<show>} {<tty>} {(DQ <'Show tty used for debugger output'>)} {<1>}) (command.ShFunction name: _Dbg_do_show_tty body: (BraceGroup children: [ (C {<typeset>} {<label>}) (command.AndOr ops: [Id.Op_DAmp Id.Op_DPipe] children: [ (command.DBracket expr: (bool_expr.Unary op_id:Id.BoolUnary_n child:{($ Id.VSub_Number '$1')}) ) (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:label) op: assign_op.Equal rhs: { (command_sub left_token: <Id.Left_DollarParen '$('> child: (C {<builtin>} {<printf>} {(SQ <'%-12s: '>)} {(SQ <'show tty'>)}) ) } spids: [94] ) ] ) (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:label) op: assign_op.Equal rhs: {(SQ )} spids: [111] ) ] ) ] ) (C {<_Dbg_msg_nocr>} {(DQ (${ Id.VSub_Name label) <'Debugger output goes to '>)}) (command.If arms: [ (if_arm cond: (condition.Shell commands: [ (command.Sentence child: (command.DBracket expr: (bool_expr.Unary op_id: Id.BoolUnary_n child: {($ Id.VSub_DollarName '$_Dbg_tty')} ) ) terminator: <Id.Op_Semi _> ) ] ) action: [ (C {<_Dbg_msg>} {(command_sub left_token:<Id.Left_DollarParen '$('> child:(C {<tty>}))} ) ] spids: [128 140] ) ] else_action: [(C {<_Dbg_msg>} {($ Id.VSub_DollarName '$_Dbg_tty')})] ) (command.ControlFlow token:<Id.ControlFlow_Return return> arg_word:{<0>}) ] ) ) ] )