(CommandList
  children: [
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:listall) op:Equal rhs:{(0)} spids:[20])]
          spids: [20]
        )
      terminator: <Op_Semi ';'>
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:errors) op:Equal rhs:{(0)} spids:[24])]
          spids: [24]
        )
      terminator: <Op_Semi ';'>
    )
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:checked) op:Equal rhs:{(0)} spids:[28])]
      spids: [28]
    )
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: 
                (C {(Lit_Other '[')} {(DQ ($ VSub_Number '$1'))} {(Lit_Other '=')} {(DQ (-a))} 
                  {(Lit_Other ']')}
                )
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (Sentence
              child: 
                (Assignment
                  keyword: Assign_None
                  pairs: [(assign_pair lhs:(LhsName name:listall) op:Equal rhs:{(1)} spids:[53])]
                  spids: [53]
                )
              terminator: <Op_Semi ';'>
            )
            (C {(shift)})
          ]
          spids: [16777215 50]
        )
      ]
      spids: [16777215 59]
    )
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: (C {(Lit_Other '[')} {(-z)} {(DQ ($ VSub_Number '$1'))} {(Lit_Other ']')})
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (Sentence
              child: 
                (SimpleCommand
                  words: [
                    {(echo)}
                    {
                      (DQ ('Usage: ') 
                        (CommandSubPart
                          command_list: 
                            (CommandList
                              children: [(C {(basename)} {($ VSub_Number '$0')})]
                            )
                          left_token: <Left_CommandSub '$('>
                          spids: [83 87]
                        ) (' [-a] URL')
                      )
                    }
                  ]
                  redirects: [(Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[91])]
                )
              terminator: <Op_Semi ';'>
            )
            (ControlFlow token:<ControlFlow_Exit exit> arg_word:{(1)})
          ]
          spids: [16777215 76]
        )
      ]
      spids: [16777215 100]
    )
    (C {(trap)} 
      {
        (DQ 
          (CommandSubPart
            command_list: (CommandList children:[(C {(which)} {(rm)})])
            left_token: <Left_Backtick '`'>
            spids: [106 110]
          ) (' -f traverse*.errors reject*.dat traverse*.dat')
        )
      } {(0)}
    )
    (Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (LhsName name:outfile)
          op: Equal
          rhs: 
            {
              (DQ 
                (CommandSubPart
                  command_list: 
                    (CommandList
                      children: [
                        (Pipeline
                          children: [
                            (C {(echo)} {(DQ ($ VSub_Number '$1'))})
                            (C {(cut)} {(-d/)} {(-f3)})
                          ]
                          negated: F
                        )
                      ]
                    )
                  left_token: <Left_CommandSub '$('>
                  spids: [119 133]
                ) (.errors.ext)
              )
            }
          spids: [117]
        )
      ]
      spids: [117]
    )
    (Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (LhsName name:URLlist)
          op: Equal
          rhs: 
            {
              (DQ 
                (CommandSubPart
                  command_list: 
                    (CommandList
                      children: [
                        (Pipeline
                          children: [
                            (C {(echo)} {($ VSub_Number '$1')})
                            (C {(cut)} {(-d/)} {(-f3)})
                            (C {(sed)} {(SQ <'s/www\\.//'>)})
                          ]
                          negated: F
                        )
                      ]
                    )
                  left_token: <Left_CommandSub '$('>
                  spids: [139 159]
                ) (.rejects)
              )
            }
          spids: [137]
        )
      ]
      spids: [137]
    )
    (C {(rm)} {(-f)} {($ VSub_Name '$outfile')})
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: 
                (C {(Lit_Other '[')} {(KW_Bang '!')} {(-e)} {(DQ ($ VSub_Name '$URLlist'))} 
                  {(Lit_Other ']')}
                )
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (Sentence
              child: 
                (SimpleCommand
                  words: [
                    {(echo)}
                    {
                      (DQ ('File ') ($ VSub_Name '$URLlist') 
                        (' not found. Please run checklinks first.')
                      )
                    }
                  ]
                  redirects: [(Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[201])]
                )
              terminator: <Op_Semi ';'>
            )
            (ControlFlow token:<ControlFlow_Exit exit> arg_word:{(1)})
          ]
          spids: [16777215 190]
        )
      ]
      spids: [16777215 209]
    )
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: 
                (C {(Lit_Other '[')} {(KW_Bang '!')} {(-s)} {(DQ ($ VSub_Name '$URLlist'))} 
                  {(Lit_Other ']')}
                )
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (SimpleCommand
              words: [
                {(echo)}
                {
                  (DQ ("There don't appear to be any external links (") ($ VSub_Name '$URLlist') 
                    (' is empty)')
                  )
                }
              ]
              redirects: [(Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[239])]
            )
            (ControlFlow token:<ControlFlow_Exit exit> arg_word:{(1)})
          ]
          spids: [16777215 228]
        )
      ]
      spids: [16777215 247]
    )
    (ForEach
      iter_name: URL
      iter_words: [
        {
          (CommandSubPart
            command_list: 
              (CommandList
                children: [
                  (Pipeline
                    children: [(C {(cat)} {($ VSub_Name '$URLlist')}) (C {(sort)}) (C {(uniq)})]
                    negated: F
                  )
                ]
              )
            left_token: <Left_CommandSub '$('>
            spids: [260 272]
          )
        }
      ]
      do_arg_iter: F
      body: 
        (DoGroup
          children: [
            (Sentence
              child: 
                (SimpleCommand
                  words: [{(curl)} {(-s)} {(DQ ($ VSub_Name '$URL'))}]
                  redirects: [
                    (Redir
                      op_id: Redir_Great
                      fd: 16777215
                      arg_word: {(/dev/null)}
                      spids: [285]
                    )
                    (Redir op_id:Redir_GreatAnd fd:2 arg_word:{(1)} spids:[289])
                  ]
                )
              terminator: <Op_Semi ';'>
            )
            (Assignment
              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:return)
                  op: Equal
                  rhs: {($ VSub_QMark '$?')}
                  spids: [293]
                )
              ]
              spids: [293]
            )
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: 
                        (C {(Lit_Other '[')} {($ VSub_Name '$return')} {(-eq)} {(0)} {(Lit_Other ']')})
                      terminator: <Op_Semi ';'>
                    )
                  ]
                  action: [
                    (If
                      arms: [
                        (if_arm
                          cond: [
                            (Sentence
                              child: 
                                (C {(Lit_Other '[')} {($ VSub_Name '$listall')} {(-eq)} {(1)} 
                                  {(Lit_Other ']')}
                                )
                              terminator: <Op_Semi ';'>
                            )
                          ]
                          action: [(C {(echo)} {(DQ ($ VSub_Name '$URL') (' is fine.'))})]
                          spids: [16777215 328]
                        )
                      ]
                      spids: [16777215 339]
                    )
                  ]
                  spids: [16777215 311]
                )
              ]
              else_action: [
                (C {(echo)} 
                  {(DQ ($ VSub_Name '$URL') (' fails with error code ') ($ VSub_Name '$return'))}
                )
                (Assignment
                  keyword: Assign_None
                  pairs: [
                    (assign_pair
                      lhs: (LhsName name:errors)
                      op: Equal
                      rhs: 
                        {
                          (ArithSubPart
                            anode: 
                              (ArithBinary
                                op_id: Arith_Plus
                                left: (ArithWord w:{($ VSub_Name '$errors')})
                                right: (ArithWord w:{(Lit_Digits 1)})
                              )
                            spids: [355 364]
                          )
                        }
                      spids: [354]
                    )
                  ]
                  spids: [354]
                )
              ]
              spids: [342 367]
            )
            (Assignment
              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:checked)
                  op: Equal
                  rhs: 
                    {
                      (ArithSubPart
                        anode: 
                          (ArithBinary
                            op_id: Arith_Plus
                            left: (ArithWord w:{($ VSub_Name '$checked')})
                            right: (ArithWord w:{(Lit_Digits 1)})
                          )
                        spids: [371 380]
                      )
                    }
                  spids: [370]
                )
              ]
              spids: [370]
            )
          ]
          spids: [274 382]
        )
      spids: [259 16777215]
    )
    (C {(echo)} {(DQ )})
    (C {(echo)} 
      {
        (DQ ('Done. Checked ') ($ VSub_Name '$checked') (' URLs and found ') ($ VSub_Name '$errors') 
          (' errors.')
        )
      }
    )
    (ControlFlow token:<ControlFlow_Exit exit> arg_word:{(0)})
  ]
)