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      more_env: []
      words: [
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        {<Id.KW_For for>}
        {<systems>}
        {<that>}
        {<Id.KW_Do do>}
        {<not>}
        {<support>}
        {<-p>}
        {<Id.Lit_Colon ':'>}
        {<2002-09-01>}
        {<Id.Lit_Colon ':'>}
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      redirects: []
      do_fork: T
    )
    (command.ShAssignment
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      pairs: [
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          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'MKDIR='> name:MKDIR)
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      ]
      redirects: []
    )
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      pairs: [
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          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'CHMOD='> name:CHMOD)
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          rhs: {<chmod>}
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      redirects: []
    )
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          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'mode='> name:mode)
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      redirects: []
    )
    (command.ShAssignment
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          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'parents='> name:parents)
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      redirects: []
    )
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              more_env: []
              words: [{<Id.Lit_Colon ':'>}]
              redirects: []
              do_fork: T
            )
          ]
        )
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              to_match: (case_arg.Word w:{($ Id.VSub_Number 1)})
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                  pattern: (pat.Words words:[{<-m>}])
                  middle: <Id.Right_CasePat _>
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                      to_match: (case_arg.Word w:{($ Id.VSub_Pound '#')})
                      arms_start: <Id.KW_In in>
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                          pattern: (pat.Words words:[{<1>}])
                          middle: <Id.Right_CasePat _>
                          action: [
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                              blame_tok: <echo>
                              more_env: []
                              words: [{<echo>} {(DQ <'mkdir: -m: mode argument expected'>)}]
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                                  loc: (redir_loc.Fd fd:1)
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                                )
                              ]
                              do_fork: T
                            )
                            (command.ControlFlow
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                            )
                          ]
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                        )
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                      arms_end: <Id.KW_Esac esac>
                      redirects: []
                    )
                    (command.Simple
                      blame_tok: <shift>
                      more_env: []
                      words: [{<shift>}]
                      redirects: []
                      do_fork: T
                    )
                    (command.ShAssignment
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                      pairs: [
                        (AssignPair
                          left: <Id.Lit_VarLike 'mode='>
                          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'mode='> name:mode)
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                      ]
                      redirects: []
                    )
                  ]
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                )
                (CaseArm
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                  middle: <Id.Right_CasePat _>
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                      pairs: [
                        (AssignPair
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                          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'mode='> name:mode)
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                          rhs: 
                            {
                              (CommandSub
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                                        more_env: []
                                        words: [{<echo>} {<X> ($ Id.VSub_Number 1)}]
                                        redirects: []
                                        do_fork: T
                                      )
                                      (command.Simple
                                        blame_tok: <sed>
                                        more_env: []
                                        words: [{<sed>} {(SQ <'s/X-m//'>)}]
                                        redirects: []
                                        do_fork: T
                                      )
                                    ]
                                    ops: [<Id.Op_Pipe _>]
                                  )
                                right: <Id.Backtick_Right '`'>
                              )
                            }
                        )
                      ]
                      redirects: []
                    )
                  ]
                  right: <Id.Op_DSemi _>
                )
                (CaseArm
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                  pattern: (pat.Words words:[{<-p>}])
                  middle: <Id.Right_CasePat _>
                  action: [
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                      pairs: [
                        (AssignPair
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                          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'parents='> name:parents)
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                        )
                      ]
                      redirects: []
                    )
                  ]
                  right: <Id.Op_DSemi _>
                )
                (CaseArm
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                  middle: <Id.Right_CasePat _>
                  action: [(command.ControlFlow keyword:<Id.ControlFlow_Break break>)]
                  right: <Id.Op_DSemi _>
                )
              ]
              arms_end: <Id.KW_Esac esac>
              redirects: []
            )
            (command.Simple
              blame_tok: <shift>
              more_env: []
              words: [{<shift>}]
              redirects: []
              do_fork: T
            )
          ]
          right: <Id.KW_Done done>
        )
      redirects: []
    )
    (command.If
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      arms: [
        (IfArm
          keyword: <Id.KW_If if>
          cond: 
            (condition.Shell
              commands: [
                (command.Simple
                  blame_tok: <test>
                  more_env: []
                  words: [
                    {<test>}
                    {(DQ )}
                    {<Id.KW_Bang '!'> <Id.Lit_Equals '='>}
                    {(DQ ($ Id.VSub_DollarName parents))}
                  ]
                  redirects: []
                  do_fork: T
                )
              ]
            )
          then_kw: <Id.KW_Then then>
          action: [
            (command.ForEach
              keyword: <Id.KW_For for>
              iter_names: [d]
              iterable: (for_iter__Args)
              body: 
                (command.DoGroup
                  left: <Id.KW_Do do>
                  children: [
                    (command.If
                      if_kw: <Id.KW_If if>
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                        (IfArm
                          keyword: <Id.KW_If if>
                          cond: 
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                              commands: [
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                                  blame_tok: <test>
                                  more_env: []
                                  words: [{<test>} {<Id.KW_Bang '!'>} {<-d>} {($ Id.VSub_DollarName d)}]
                                  redirects: []
                                  do_fork: T
                                )
                              ]
                            )
                          then_kw: <Id.KW_Then then>
                          action: [
                            (command.ShAssignment
                              left: <Id.Lit_VarLike 'ifs='>
                              pairs: [
                                (AssignPair
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                                  rhs: 
                                    {
                                      (BracedVarSub
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                                            arg_word: {(SQ <'\n'> <'\t '>)}
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                              redirects: []
                            )
                            (command.ShAssignment
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                              pairs: [
                                (AssignPair
                                  left: <Id.Lit_VarLike 'IFS='>
                                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'IFS='> name:IFS)
                                  op: assign_op.Equal
                                  rhs: {<'/'>}
                                )
                              ]
                              redirects: []
                            )
                            (command.Simple
                              blame_tok: <set>
                              more_env: []
                              words: [{<set>} {(SQ )} {($ Id.VSub_DollarName d)}]
                              redirects: []
                              do_fork: T
                            )
                            (command.ShAssignment
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                              pairs: [
                                (AssignPair
                                  left: <Id.Lit_VarLike 'IFS='>
                                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'IFS='> name:IFS)
                                  op: assign_op.Equal
                                  rhs: {($ Id.VSub_DollarName ifs)}
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                              ]
                              redirects: []
                            )
                            (command.Simple
                              blame_tok: <shift>
                              more_env: []
                              words: [{<shift>}]
                              redirects: []
                              do_fork: T
                            )
                            (command.ShAssignment
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                              pairs: [
                                (AssignPair
                                  left: <Id.Lit_VarLike 'dir='>
                                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'dir='> name:dir)
                                  op: assign_op.Equal
                                  rhs: {($ Id.VSub_Number 1)}
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                              ]
                              redirects: []
                            )
                            (command.Simple
                              blame_tok: <shift>
                              more_env: []
                              words: [{<shift>}]
                              redirects: []
                              do_fork: T
                            )
                            (command.If
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                              arms: [
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                                  keyword: <Id.KW_If if>
                                  cond: 
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                                          more_env: []
                                          words: [
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                                            {<-n>}
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                                            {<-d>}
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                                          redirects: []
                                          do_fork: T
                                        )
                                      ]
                                    )
                                  then_kw: <Id.KW_Then then>
                                  action: [
                                    (command.AndOr
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                                          more_env: []
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                                          redirects: []
                                          do_fork: T
                                        )
                                        (command.ControlFlow
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                                      ops: [<Id.Op_DPipe _>]
                                    )
                                    (command.If
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                                      arms: [
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                                          keyword: <Id.KW_If if>
                                          cond: 
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                                                  more_env: []
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                                                  redirects: []
                                                  do_fork: T
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                                            )
                                          then_kw: <Id.KW_Then then>
                                          action: [
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                                                  do_fork: T
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                                          spids: [312 327]
                                        )
                                      ]
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                                      fi_kw: <Id.KW_Fi fi>
                                      redirects: []
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                              ]
                              else_action: []
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                              redirects: []
                            )
                            (command.ForEach
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                              iter_names: [d]
                              iterable: (for_iter__Args)
                              body: 
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                                            (sh_lhs_expr.Name
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                                          op: assign_op.Equal
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                                      redirects: []
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                                    (command.If
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                                                  redirects: []
                                                  do_fork: T
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                                              ]
                                            )
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                                          action: [
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                                                  redirects: []
                                                  do_fork: T
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                                            (command.If
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                                                  keyword: <Id.KW_If if>
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                                                          redirects: []
                                                          do_fork: T
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                                                  action: [
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                                                          redirects: []
                                                          do_fork: T
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                                                        (command.ControlFlow
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                                              else_action: []
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                                              redirects: []
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                                          spids: [365 378]
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                                      else_action: []
                                      fi_kw: <Id.KW_Fi fi>
                                      redirects: []
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                              redirects: []
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                      else_action: []
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                      redirects: []
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              redirects: []
            )
          ]
          spids: [203 217]
        )
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              words: [{($ Id.VSub_DollarName MKDIR)} {(DQ ($ Id.VSub_At '@'))}]
              redirects: []
              do_fork: T
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            (command.ControlFlow keyword:<Id.ControlFlow_Exit exit> arg_word:{<1>})
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          ops: [<Id.Op_DPipe _>]
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                        {<Id.KW_Bang '!'> <Id.Lit_Equals '='>}
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                      redirects: []
                      do_fork: T
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                )
              then_kw: <Id.KW_Then then>
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                              redirects: []
                              do_fork: T
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                  redirects: []
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          redirects: []
        )
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      fi_kw: <Id.KW_Fi fi>
      redirects: []
    )
    (command.ControlFlow keyword:<Id.ControlFlow_Exit exit> arg_word:{<0>})
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)