(command.CommandList
  children: [
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: 
                (C {(Id.Lit_LBracket '[')} {($ Id.VSub_Pound '$#')} {(-eq)} {(0)} {(Id.Lit_RBracket ']')})
              terminator: (Token id:Id.Op_Semi val:';' span_id:32)
            )
          ]
          action: [
            (command.Simple
              words: [{(echo)} {(DQ ('Usage: ') ($ Id.VSub_Number '$0') (' [-d|-i|-x] url'))}]
              redirects: [
                (redir.Redir
                  op: (Token id:Id.Redir_GreatAnd val:'>&' span_id:45)
                  fd: -1
                  arg_word: {(2)}
                )
              ]
            )
            (command.Simple
              words: [{(echo)} {(DQ ('-d=domains only, -i=internal refs only, -x=external only'))}]
              redirects: [
                (redir.Redir
                  op: (Token id:Id.Redir_GreatAnd val:'>&' span_id:55)
                  fd: -1
                  arg_word: {(2)}
                )
              ]
            )
            (command.ControlFlow
              token: (Token id:Id.ControlFlow_Exit val:exit span_id:59)
              arg_word: {(1)}
            )
          ]
          spids: [20 34]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: 
                (C {(Id.Lit_LBracket '[')} {($ Id.VSub_Pound '$#')} {(-gt)} {(1)} {(Id.Lit_RBracket ']')})
              terminator: (Token id:Id.Op_Semi val:';' span_id:78)
            )
          ]
          action: [
            (command.Case
              to_match: {(DQ ($ Id.VSub_Number '$1'))}
              arms: [
                (case_arm
                  pat_list: [{(-d)}]
                  action: [
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:lastcmd)
                          op: assign_op.Equal
                          rhs: {(DQ ('cut -d/ -f3 | sort | uniq'))}
                          spids: [95]
                        )
                      ]
                    )
                    (C {(shift)})
                  ]
                  spids: [92 93 104 -1]
                )
                (case_arm
                  pat_list: [{(-r)}]
                  action: [
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:basedomain)
                          op: assign_op.Equal
                          rhs: 
                            {
                              (DQ ('http://') 
                                (command_sub
                                  left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:113)
                                  command_list: 
                                    (command.CommandList
                                      children: [
                                        (command.Pipeline
                                          children: [
                                            (C {(echo)} {($ Id.VSub_Number '$2')})
                                            (C {(cut)} {(-d/)} {(-f3)})
                                          ]
                                          negated: F
                                        )
                                      ]
                                    )
                                ) (/)
                              )
                            }
                          spids: [110]
                        )
                      ]
                    )
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:lastcmd)
                          op: assign_op.Equal
                          rhs: 
                            {
                              (DQ ('grep ') 
                                (word_part.EscapedLiteral
                                  token: (Token id:Id.Lit_EscapedChar val:'\\"' span_id:133)
                                ) ('^') ($ Id.VSub_DollarName '$basedomain') 
                                (word_part.EscapedLiteral
                                  token: (Token id:Id.Lit_EscapedChar val:'\\"' span_id:136)
                                ) (' | sed ') (word_part.EscapedLiteral token:(Token id:Id.Lit_EscapedChar val:'\\"' span_id:138)) ('s|') 
                                ($ Id.VSub_DollarName '$basedomain') ('||g') (word_part.EscapedLiteral token:(Token id:Id.Lit_EscapedChar val:'\\"' span_id:142)) 
                                (' | sort |') ('\t     uniq')
                              )
                            }
                          spids: [130]
                        )
                      ]
                    )
                    (C {(shift)})
                  ]
                  spids: [107 108 152 -1]
                )
                (case_arm
                  pat_list: [{(-a)}]
                  action: [
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:basedomain)
                          op: assign_op.Equal
                          rhs: 
                            {
                              (DQ ('http://') 
                                (command_sub
                                  left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:161)
                                  command_list: 
                                    (command.CommandList
                                      children: [
                                        (command.Pipeline
                                          children: [
                                            (C {(echo)} {($ Id.VSub_Number '$2')})
                                            (C {(cut)} {(-d/)} {(-f3)})
                                          ]
                                          negated: F
                                        )
                                      ]
                                    )
                                ) (/)
                              )
                            }
                          spids: [158]
                        )
                      ]
                    )
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:lastcmd)
                          op: assign_op.Equal
                          rhs: 
                            {
                              (DQ ('grep -v ') 
                                (word_part.EscapedLiteral
                                  token: (Token id:Id.Lit_EscapedChar val:'\\"' span_id:181)
                                ) ('^') ($ Id.VSub_DollarName '$basedomain') 
                                (word_part.EscapedLiteral
                                  token: (Token id:Id.Lit_EscapedChar val:'\\"' span_id:184)
                                ) (' | sort | uniq')
                              )
                            }
                          spids: [178]
                        )
                      ]
                    )
                    (C {(shift)})
                  ]
                  spids: [155 156 192 -1]
                )
                (case_arm
                  pat_list: [{(Id.Lit_Star '*')}]
                  action: [
                    (command.Sentence
                      child: 
                        (command.Simple
                          words: [
                            {(echo)}
                            {
                              (DQ ($ Id.VSub_Number '$0') (': unknown option specified: ') 
                                ($ Id.VSub_Number '$1')
                              )
                            }
                          ]
                          redirects: [
                            (redir.Redir
                              op: (Token id:Id.Redir_GreatAnd val:'>&' span_id:206)
                              fd: -1
                              arg_word: {(2)}
                            )
                          ]
                        )
                      terminator: (Token id:Id.Op_Semi val:';' span_id:208)
                    )
                    (command.ControlFlow
                      token: (Token id:Id.ControlFlow_Exit val:exit span_id:210)
                      arg_word: {(1)}
                    )
                  ]
                  spids: [195 196 -1 215]
                )
              ]
            )
          ]
          spids: [66 80]
        )
      ]
      else_action: [
        (command.ShAssignment
          pairs: [
            (assign_pair
              lhs: (sh_lhs_expr.Name name:lastcmd)
              op: assign_op.Equal
              rhs: {(DQ ('sort | uniq'))}
              spids: [220]
            )
          ]
        )
      ]
    )
    (command.Pipeline
      children: [
        (C {(lynx)} {(-dump)} {(DQ ($ Id.VSub_Number '$1'))})
        (C {(sed)} {(-n)} {(SQ (Token id:Id.Lit_Chars val:'/^References$/,$p' span_id:244))})
        (C {(grep)} {(-E)} {(SQ (Token id:Id.Lit_Chars val:'[[:digit:]]+\\.' span_id:256))})
        (C {(awk)} {(SQ (Token id:Id.Lit_Chars val:'{print $2}' span_id:266))})
        (C {(cut)} 
          {(-d) (word_part.EscapedLiteral token:(Token id:Id.Lit_EscapedChar val:'\\?' span_id:276))} {(-f1)}
        )
        (C {(eval)} {($ Id.VSub_DollarName '$lastcmd')})
      ]
      negated: F
    )
    (command.ControlFlow token:(Token id:Id.ControlFlow_Exit val:exit span_id:288) arg_word:{(0)})
  ]
)