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        (assign_pair
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          op: assign_op.Equal
          rhs: {<0>}
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    )
    (command.ShAssignment
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        (assign_pair
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          spids: [136]
        )
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    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:secsz)
          op: assign_op.Equal
          rhs: {<512>}
          spids: [147]
        )
      ]
    )
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    (command.ShFunction
      name: usage
      body: 
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          children: [
            (command.Simple
              words: [{<cat>}]
              redirects: [
                (redir
                  op: <Id.Redir_DLessDash '<<-'>
                  loc: (redir_loc.Fd fd:0)
                  arg: 
                    (redir_param.HereDoc
                      here_begin: {<END>}
                      here_end_span_id: 194
                      stdin_parts: [
                        <'USAGE: bitesize [-h] [-b buckets] [seconds]\n'>
                        <'                 -b buckets      # specify histogram buckets (Kbytes)\n'>
                        <'                 -h              # this usage message\n'>
                        <'   eg,\n'>
                        <'       bitesize                  # trace I/O size until Ctrl-C\n'>
                        <'       bitesize 10               # trace I/O size for 10 seconds\n'>
                        <'       bitesize -b '>
                        <Id.Right_DoubleQuote '"'>
                        <'8 16 32'>
                        <Id.Right_DoubleQuote '"'>
                        <'     # specify custom bucket points\n'>
                      ]
                    )
                )
                (redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})
              ]
              do_fork: T
            )
            (command.ControlFlow token:<Id.ControlFlow_Exit exit>)
          ]
        )
    )
    (command.ShFunction
      name: die
      body: 
        (BraceGroup
          children: [
            (command.Simple
              words: [{<echo>} {(DQ ($ Id.VSub_At '$@'))}]
              redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
            )
            (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<1>})
          ]
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    )
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      body: 
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                (case_arm
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                  action: [
                    (command.ShAssignment
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                          rhs: 
                            {
                              (sh_array_literal
                                left: <Id.Op_LParen _>
                                words: [{($ Id.VSub_DollarName '$OPTARG')}]
                              )
                            }
                          spids: [251]
                        )
                      ]
                    )
                  ]
                  spids: [248 249 256 -1]
                )
                (case_arm
                  pat_list: [{<h>} {<Id.Lit_QMark '?'>}]
                  action: [(C {<usage>})]
                  spids: [259 262 266 -1]
                )
              ]
            )
          ]
        )
    )
    (C {<shift>} 
      {
        (word_part.ArithSub
          anode: 
            (arith_expr.Binary
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              left: {($ Id.VSub_DollarName '$OPTIND')}
              right: {<Id.Lit_Digits 1>}
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        )
      }
    )
    (command.ShAssignment
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        (assign_pair
          lhs: (sh_lhs_expr.Name name:tpoint)
          op: assign_op.Equal
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          spids: [286]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:var)
          op: assign_op.Equal
          rhs: {<nr_sector>}
          spids: [291]
        )
      ]
    )
    (command.ShAssignment
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        (assign_pair
          lhs: (sh_lhs_expr.Name name:duration)
          op: assign_op.Equal
          rhs: {($ Id.VSub_Number '$1')}
          spids: [294]
        )
      ]
    )
    (command.ShAssignment
      pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:i) op:assign_op.Equal rhs:{<0>} spids:[301])]
    )
    (command.ShAssignment
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        (assign_pair
          lhs: (sh_lhs_expr.Name name:sectors)
          op: assign_op.Equal
          rhs: 
            {
              (sh_array_literal
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                    (braced_var_sub
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                    )
                  }
                ]
              )
            }
          spids: [304]
        )
      ]
    )
    (command.DParen
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        (arith_expr.BinaryAssign
          op_id: Id.Arith_Equal
          left: <Id.Lit_ArithVarLike max_i>
          right: 
            (arith_expr.Binary
              op_id: Id.Arith_Minus
              left: 
                {
                  (braced_var_sub
                    token: <Id.VSub_Name buckets>
                    prefix_op: (Id.VSub_Pound)
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                  )
                }
              right: {<Id.Lit_Digits 1>}
            )
        )
    )
    (command.WhileUntil
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      cond: 
        (condition.Shell
          commands: [
            (command.Sentence
              child: 
                (command.DParen
                  child: 
                    (arith_expr.Binary
                      op_id: Id.Arith_LessEqual
                      left: <Id.Lit_ArithVarLike i>
                      right: <Id.Lit_ArithVarLike max_i>
                    )
                )
              terminator: <Id.Op_Semi _>
            )
          ]
        )
      body: 
        (command.DoGroup
          children: [
            (command.DParen
              child: 
                (arith_expr.BinaryAssign
                  op_id: Id.Arith_Equal
                  left: 
                    (arith_expr.Binary
                      op_id: Id.Arith_LBracket
                      left: <Id.Lit_ArithVarLike sectors>
                      right: {($ Id.VSub_DollarName '$i')}
                    )
                  right: 
                    (arith_expr.Binary
                      op_id: Id.Arith_Slash
                      left: 
                        (arith_expr.Binary
                          op_id: Id.Arith_Star
                          left: 
                            {
                              (braced_var_sub
                                token: <Id.VSub_Name sectors>
                                bracket_op: (bracket_op.ArrayIndex expr:{($ Id.VSub_DollarName '$i')})
                              )
                            }
                          right: {<Id.Lit_Digits 1024>}
                        )
                      right: {($ Id.VSub_DollarName '$secsz')}
                    )
                )
            )
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.DParen
                              child: 
                                (arith_expr.Binary
                                  op_id: Id.Arith_Great
                                  left: <Id.Lit_ArithVarLike i>
                                  right: {<Id.Lit_Digits 0>}
                                )
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (command.If
                      arms: [
                        (if_arm
                          cond: 
                            (condition.Shell
                              commands: [
                                (command.Sentence
                                  child: 
                                    (command.DParen
                                      child: 
                                        (arith_expr.Binary
                                          op_id: Id.Arith_LessEqual
                                          left: 
                                            {
                                              (braced_var_sub
                                                token: <Id.VSub_Name sectors>
                                                bracket_op: 
                                                  (bracket_op.ArrayIndex
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                                              )
                                            }
                                          right: 
                                            {
                                              (braced_var_sub
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                                                bracket_op: 
                                                  (bracket_op.ArrayIndex
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                                                      (arith_expr.Binary
                                                        op_id: Id.Arith_Minus
                                                        left: {($ Id.VSub_DollarName '$i')}
                                                        right: {<Id.Lit_Digits 1>}
                                                      )
                                                  )
                                              )
                                            }
                                        )
                                    )
                                  terminator: <Id.Op_Semi _>
                                )
                              ]
                            )
                          action: [(C {<die>} {(DQ <'ERROR: bucket list must increase in size.'>)})]
                          spids: [398 426]
                        )
                      ]
                    )
                  ]
                  spids: [382 395]
                )
              ]
            )
            (command.DParen
              child: (arith_expr.UnaryAssign op_id:Id.Node_PostDPlus child:<Id.Lit_ArithVarLike i>)
            )
          ]
        )
    )
    (command.ShAssignment
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        (assign_pair
          lhs: (sh_lhs_expr.Name name:max_b)
          op: assign_op.Equal
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            {
              (braced_var_sub
                token: <Id.VSub_Name buckets>
                bracket_op: (bracket_op.ArrayIndex expr:{($ Id.VSub_DollarName '$max_i')})
              )
            }
          spids: [456]
        )
      ]
    )
    (command.ShAssignment
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        (assign_pair
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            {
              (braced_var_sub
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            }
          spids: [464]
        )
      ]
    )
    (command.ShAssignment
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        (assign_pair
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            {
              (DQ <'-e '> ($ Id.VSub_DollarName '$tpoint') <' --filter '> 
                (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) ($ Id.VSub_DollarName '$var') <' < '> 
                (braced_var_sub
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              )
            }
          spids: [472]
        )
      ]
    )
    (command.ShAssignment
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        (assign_pair
          lhs: (sh_lhs_expr.Name name:awkarray)
          op: assign_op.Equal
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        )
      ]
    )
    (command.ShAssignment
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    )
    (command.WhileUntil
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      cond: 
        (condition.Shell
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                    (arith_expr.Binary
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                )
              terminator: <Id.Op_Semi _>
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        )
      body: 
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                    {
                      (DQ ($ Id.VSub_DollarName '$tpoints') <' -e '> ($ Id.VSub_DollarName '$tpoint') 
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                        (braced_var_sub
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                )
              ]
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                          token: <Id.VSub_Name sectors>
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                                (arith_expr.Binary
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                            )
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                      )
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                  spids: [530]
                )
              ]
            )
            (command.ShAssignment
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                (assign_pair
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                    {
                      (DQ ($ Id.VSub_DollarName '$awkarray') <' buckets['> ($ Id.VSub_DollarName '$i') 
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                        (braced_var_sub
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                    }
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              ]
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            (command.DParen
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    )
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            (condition.Shell
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                (assign_pair
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                (assign_pair
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              ]
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            (assign_pair
              lhs: (sh_lhs_expr.Name name:etext)
              op: assign_op.Equal
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            )
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            (assign_pair
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              op: assign_op.Equal
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            )
          ]
        )
      ]
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    (C {<echo>} {(DQ <'Tracing block I/O size (bytes), '> ($ Id.VSub_DollarName '$etext') <...>)})
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        (assign_pair
          lhs: (sh_lhs_expr.Name name:out)
          op: assign_op.Equal
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          spids: [668]
        )
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    )
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        (assign_pair
          lhs: (sh_lhs_expr.Name name:stat)
          op: assign_op.Equal
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            {
              (command_sub
                left_token: <Id.Left_DollarParen '$('>
                child: 
                  (command.Simple
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                      {<eval>}
                      {<perf>}
                      {<stat>}
                      {($ Id.VSub_DollarName '$tpoints')}
                      {<-a>}
                      {($ Id.VSub_DollarName '$out')}
                      {($ Id.VSub_DollarName '$cmd')}
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                    redirects: [(redir op:<Id.Redir_GreatAnd '2>&'> loc:(redir_loc.Fd fd:2) arg:{<1>})]
                    do_fork: T
                  )
              )
            }
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        )
      ]
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    (command.If
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            (condition.Shell
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                          right: {<Id.Lit_Digits 0>}
                        )
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (command.Simple
              words: [{<echo>} {(DQ <'ERROR running perf:'>)}]
              redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
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            (command.Simple
              words: [{<echo>} {(DQ ($ Id.VSub_DollarName '$stat'))}]
              redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
            )
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                        {
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                            <'\tEND { print m }'>
                          )
                        }
                      )
                    ]
                    negated: F
                  )
              )
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          {
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              <'\t\t# using int could avoid error on gawk\n'> <'\t\tif (int(smax) == 0) return ""\n'> <'\t\tfor (si = 0; si < (swidth * sval / smax); si++) {\n'> 
              <'\t\t\tstars = stars "#"\n'> <'\t\t}\n'> <'\t\treturn stars\n'> <'\t}\n'> <'\tBEGIN {\n'> <'\t\t'>
            ) (DQ ($ Id.VSub_DollarName '$awkarray')) 
            (SQ <'\n'> <'\t\tprintf("            %-15s: %-8s %s\\n", "Kbytes", "I/O",\n'> 
              <'\t\t    "Distribution")\n'> <'\t}\n'> <'\t/Performance counter stats/ { i = -1 }\n'> 
              <'\t# reverse order of rule set is important\n'> <'\t{ ok = 0 }\n'> <'\t$2 == tpoint { num = $1; gsub(/,/, "", num); ok = 1 }\n'> 
              <'\tok && i >= max_i {\n'> <'\t\tprintf("   %10.1f -> %-10s: %-8s |%-38s|\\n",\n'> 
              <'\t\t    buckets[i], "", num, star(num, most, 38))\n'> <'\t\tnext\n'> <'\t}\n'> <'\tok && i >= 0 && i < max_i {\n'> 
              <'\t\tprintf("   %10.1f -> %-10.1f: %-8s |%-38s|\\n",\n'> <'\t\t    buckets[i], buckets[i+1] - 0.1, num,\n'> <'\t\t    star(num, most, 38))\n'> <'\t\ti++\n'> 
              <'\t\tnext\n'> <'\t}\n'> <'\tok && i == -1 {\n'> <'\t\tprintf("   %10s -> %-10.1f: %-8s |%-38s|\\n", "",\n'> 
              <'\t\t    buckets[0] - 0.1, num, star(num, most, 38))\n'> <'\t\ti++\n'> <'\t}\n'>
            )
          }
        )
      ]
      negated: F
    )
  ]
)