(command.CommandList
  children: [
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: 
                (C {<Id.Lit_LBracket '['>} {($ Id.VSub_Pound '$#')} {<-ne>} {<1>} {<Id.Lit_RBracket ']'>})
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (command.Simple
              words: [
                {<echo>}
                {
                  (DQ <'Usage: '> 
                    (command_sub
                      left_token: <Id.Left_Backtick '`'>
                      command_list: 
                        (command.CommandList
                          children: [(C {<basename>} {($ Id.VSub_Number '$0')})]
                        )
                    ) <' path'>
                  )
                }
              ]
              redirects: [(redir.Redir op:<Id.Redir_GreatAnd '>&'> fd:-1 arg_word:{<2>})]
            )
            (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<1>})
          ]
          spids: [12 25]
        )
      ]
    )
    (command.Pipeline
      children: [
        (C {<stat>} {($ Id.VSub_Number '$1')})
        (C {<sed>} {<-n>} {(SQ <'s/^Access: (\\([0-9]\\{1,\\}\\).*/\\1/p'>)})
      ]
      negated: F
    )
  ]
)