(command.CommandList
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          op: assign_op.Equal
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              ]
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        (command.ShAssignment
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        (command.Sentence
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                  op: assign_op.Equal
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          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
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                  op: assign_op.Equal
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                )
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          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
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                  lhs: (sh_lhs_expr.Name name:opt_tid)
                  op: assign_op.Equal
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                )
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        )
        (command.ShAssignment
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    )
    (command.CommandList
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                (assign_pair
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                  op: assign_op.Equal
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                  spids: [178]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:filter)
                  op: assign_op.Equal
                  rhs: (word.Empty)
                  spids: [182]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:opt_view)
                  op: assign_op.Equal
                  rhs: {<0>}
                  spids: [185]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:opt_headers)
                  op: assign_op.Equal
                  rhs: {<0>}
                  spids: [189]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:opt_stack)
                  op: assign_op.Equal
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                  spids: [193]
                )
              ]
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        )
        (command.ShAssignment
          pairs: [
            (assign_pair
              lhs: (sh_lhs_expr.Name name:dmesg)
              op: assign_op.Equal
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            )
          ]
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    )
    (command.CommandList
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          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
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                )
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        )
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              op: assign_op.Equal
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            )
          ]
        )
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    )
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      body: 
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          children: [
            (command.Simple
              words: [{<cat>}]
              redirects: [
                (redir
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                      here_end_span_id: 286
                      stdin_parts: [
                        <
'USAGE: kprobe [-FhHsv] [-d secs] [-p PID] [-L TID] kprobe_definition [filter]\n'
                        >
                        <'                 -F              # force. trace despite warnings.\n'>
                        <'                 -d seconds      # trace duration, and use buffers\n'>
                        <'                 -p PID          # PID to match on events\n'>
                        <'                 -L TID          # thread id to match on events\n'>
                        <'                 -v              # view format file (don\'t trace)\n'>
                        <'                 -H              # include column headers\n'>
                        <'                 -s              # show kernel stack traces\n'>
                        <'                 -h              # this usage message\n'>
                        <'\n'>
                        <'Note that these examples may need modification to match your kernel\n'>
                        <'version\'s function names and platform\'s register usage.\n'>
                        <'   eg,\n'>
                        <'       kprobe p:do_sys_open\n'>
                        <'                                 # trace open() entry\n'>
                        <'       kprobe r:do_sys_open\n'>
                        <'                                 # trace open() return\n'>
                        <'       kprobe \'r:do_sys_open '>
                        (word_part.EscapedLiteral
                          token: <Id.Lit_EscapedChar '\\$'>
                        )
                        <'retval\'\n'>
                        <'                                 # trace open() return value\n'>
                        <'       kprobe \'r:myopen do_sys_open '>
                        (word_part.EscapedLiteral
                          token: <Id.Lit_EscapedChar '\\$'>
                        )
                        <'retval\'\n'>
                        <'                                 # use a custom probe name\n'>
                        <'       kprobe \'p:myopen do_sys_open mode=%cx:u16\'\n'>
                        <'                                 # trace open() file mode\n'>
                        <'       kprobe \'p:myopen do_sys_open filename=+0(%si):string\'\n'>
                        <'                                 # trace open() with filename\n'>
                        <'       kprobe -s \'p:myprobe tcp_retransmit_skb\'\n'>
                        <'                                 # show kernel stacks\n'>
                        <'       kprobe \'p:do_sys_open file=+0(%si):string\' \'file ~ '>
                        <Id.Right_DoubleQuote '"'>
                        <'*stat'>
                        <Id.Right_DoubleQuote '"'>
                        <'\'\n'>
                        <'                                 # opened files ending in '>
                        <Id.Right_DoubleQuote '"'>
                        <stat>
                        <Id.Right_DoubleQuote '"'>
                        <'\n'>
                        <'\n'>
                        <'See the man page and example file for more info.\n'>
                      ]
                    )
                )
                (redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})
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              do_fork: T
            )
            (command.ControlFlow token:<Id.ControlFlow_Exit exit>)
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        )
    )
    (command.ShFunction
      name: warn
      body: 
        (BraceGroup
          children: [
            (command.If
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                (if_arm
                  cond: 
                    (condition.Shell
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                        (command.Sentence
                          child: 
                            (command.Pipeline
                              children: [(C {<eval>} {(DQ ($ Id.VSub_At '$@'))})]
                              negated: T
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (command.Simple
                      words: [
                        {<echo>}
                        {
                          (DQ <'WARNING: command failed '> 
                            (word_part.EscapedLiteral
                              token: <Id.Lit_EscapedChar '\\"'>
                            ) ($ Id.VSub_At '$@') (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>)
                          )
                        }
                      ]
                      redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
                      do_fork: T
                    )
                  ]
                  spids: [300 311]
                )
              ]
            )
          ]
        )
    )
    (command.ShFunction
      name: end
      body: 
        (BraceGroup
          children: [
            (command.Simple
              words: [{<echo>}]
              redirects: [(redir op:<Id.Redir_Great '2>'> loc:(redir_loc.Fd fd:2) arg:{<'/dev/null'>})]
              do_fork: T
            )
            (command.Simple
              words: [{<echo>} {(DQ <'Ending tracing...'>)}]
              redirects: [(redir op:<Id.Redir_Great '2>'> loc:(redir_loc.Fd fd:2) arg:{<'/dev/null'>})]
              do_fork: T
            )
            (C {<cd>} {($ Id.VSub_DollarName '$tracing')})
            (C {<warn>} {(DQ <'echo 0 > events/kprobes/'> ($ Id.VSub_DollarName '$kname') <'/enable'>)})
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                (if_arm
                  cond: 
                    (condition.Shell
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                          terminator: <Id.Op_Semi _>
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                    )
                  action: [
                    (C {<warn>} 
                      {(DQ <'echo 0 > events/kprobes/'> ($ Id.VSub_DollarName '$kname') <'/filter'>)}
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                  ]
                  spids: [373 383]
                )
              ]
            )
            (C {<warn>} {(DQ <'echo -:'> ($ Id.VSub_DollarName '$kname') <' >> kprobe_events'>)})
            (command.AndOr
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              children: [
                (command.DParen child:<Id.Lit_ArithVarLike opt_stack>)
                (C {<warn>} {(DQ <'echo 0 > options/stacktrace'>)})
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            )
            (C {<warn>} {(DQ <'echo > trace'>)})
            (command.AndOr
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                (command.DParen child:<Id.Lit_ArithVarLike wroteflock>)
                (C {<warn>} {(DQ <'rm '> ($ Id.VSub_DollarName '$flock'))})
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          ]
        )
    )
    (command.ShFunction
      name: die
      body: 
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            (command.Simple
              words: [{<echo>} {(DQ ($ Id.VSub_At '$@'))}]
              redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
            )
            (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<1>})
          ]
        )
    )
    (command.ShFunction
      name: edie
      body: 
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            (command.Simple
              words: [{<echo>} {(DQ ($ Id.VSub_At '$@'))}]
              redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
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            (command.Simple
              words: [{<exec>}]
              redirects: [
                (redir
                  op: <Id.Redir_Great '>'>
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                )
                (redir op:<Id.Redir_GreatAnd '2>&'> loc:(redir_loc.Fd fd:2) arg:{<1>})
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              do_fork: T
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            (C {<end>})
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        )
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            (command.Case
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                (case_arm
                  pat_list: [{<F>}]
                  action: [
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                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:opt_force)
                          op: assign_op.Equal
                          rhs: {<1>}
                          spids: [543]
                        )
                      ]
                    )
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                  spids: [540 541 546 -1]
                )
                (case_arm
                  pat_list: [{<d>}]
                  action: [
                    (command.Sentence
                      child: 
                        (command.ShAssignment
                          pairs: [
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                              lhs: (sh_lhs_expr.Name name:opt_duration)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [552]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:duration)
                          op: assign_op.Equal
                          rhs: {($ Id.VSub_DollarName '$OPTARG')}
                          spids: [556]
                        )
                      ]
                    )
                  ]
                  spids: [549 550 559 -1]
                )
                (case_arm
                  pat_list: [{<p>}]
                  action: [
                    (command.Sentence
                      child: 
                        (command.ShAssignment
                          pairs: [
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                              lhs: (sh_lhs_expr.Name name:opt_pid)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [565]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                    (command.ShAssignment
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                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:pid)
                          op: assign_op.Equal
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                          spids: [569]
                        )
                      ]
                    )
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                  spids: [562 563 572 -1]
                )
                (case_arm
                  pat_list: [{<L>}]
                  action: [
                    (command.Sentence
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                        (command.ShAssignment
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                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:opt_tid)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [578]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:tid)
                          op: assign_op.Equal
                          rhs: {($ Id.VSub_DollarName '$OPTARG')}
                          spids: [582]
                        )
                      ]
                    )
                  ]
                  spids: [575 576 585 -1]
                )
                (case_arm
                  pat_list: [{<H>}]
                  action: [
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:opt_headers)
                          op: assign_op.Equal
                          rhs: {<1>}
                          spids: [591]
                        )
                      ]
                    )
                  ]
                  spids: [588 589 594 -1]
                )
                (case_arm
                  pat_list: [{<s>}]
                  action: [
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:opt_stack)
                          op: assign_op.Equal
                          rhs: {<1>}
                          spids: [600]
                        )
                      ]
                    )
                  ]
                  spids: [597 598 603 -1]
                )
                (case_arm
                  pat_list: [{<v>}]
                  action: [
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:opt_view)
                          op: assign_op.Equal
                          rhs: {<1>}
                          spids: [609]
                        )
                      ]
                    )
                  ]
                  spids: [606 607 612 -1]
                )
                (case_arm
                  pat_list: [{<h>} {<Id.Lit_QMark '?'>}]
                  action: [(C {<usage>})]
                  spids: [615 618 622 -1]
                )
              ]
            )
          ]
        )
    )
    (C {<shift>} 
      {
        (word_part.ArithSub
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            (arith_expr.Binary
              op_id: Id.Arith_Minus
              left: {($ Id.VSub_DollarName '$OPTIND')}
              right: {<Id.Lit_Digits 1>}
            )
        )
      }
    )
    (command.AndOr
      ops: [Id.Op_DPipe]
      children: [(command.DParen child:{($ Id.VSub_Pound '$#')}) (C {<usage>})]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:kprobe)
          op: assign_op.Equal
          rhs: {($ Id.VSub_Number '$1')}
          spids: [653]
        )
      ]
    )
    (C {<shift>})
    (command.If
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        (if_arm
          cond: 
            (condition.Shell
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                (command.Sentence
                  child: (command.DParen child:{($ Id.VSub_Pound '$#')})
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:opt_filter)
                  op: assign_op.Equal
                  rhs: {<1>}
                  spids: [671]
                )
              ]
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:filter)
                  op: assign_op.Equal
                  rhs: {($ Id.VSub_Number '$1')}
                  spids: [675]
                )
              ]
            )
          ]
          spids: [658 668]
        )
      ]
    )
    (command.AndOr
      ops: [Id.Op_DAmp]
      children: [
        (command.DParen
          child: 
            (arith_expr.Binary
              op_id: Id.Arith_Great
              left: 
                (arith_expr.Binary
                  op_id: Id.Arith_Plus
                  left: 
                    (arith_expr.Binary
                      op_id: Id.Arith_Plus
                      left: <Id.Lit_ArithVarLike opt_pid>
                      right: <Id.Lit_ArithVarLike opt_filter>
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                  right: <Id.Lit_ArithVarLike opt_tid>
                )
              right: {<Id.Lit_Digits 1>}
            )
        )
        (C {<die>} {(DQ <'ERROR: use at most one of -p, -L, or filter.'>)})
      ]
    )
    (command.AndOr
      ops: [Id.Op_DAmp]
      children: [
        (command.DParen
          child: 
            (arith_expr.Binary
              op_id: Id.Arith_DAmp
              left: <Id.Lit_ArithVarLike opt_duration>
              right: <Id.Lit_ArithVarLike opt_view>
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        )
        (C {<die>} {(DQ <'ERROR: use either -d or -v.'>)})
      ]
    )
    (command.If
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        (if_arm
          cond: 
            (condition.Shell
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                  terminator: <Id.Op_Semi _>
                )
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            )
          action: [
            (command.ShAssignment
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                (assign_pair
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                  op: assign_op.Equal
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                )
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            )
            (command.ForEach
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              iterable: 
                (for_iter.Words
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              body: 
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                          rhs: 
                            {
                              (DQ ($ Id.VSub_DollarName '$filter') <' || common_pid == '> 
                                (braced_var_sub
                                  token: <Id.VSub_Name tid>
                                  suffix_op: 
                                    (suffix_op.Unary
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                                      arg_word: {<Id.Lit_Other '*'> <Id.Lit_Slash '/'>}
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                                )
                              )
                            }
                          spids: [772]
                        )
                      ]
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                )
            )
            (command.ShAssignment
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                      (braced_var_sub
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            )
          action: [
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                  op: assign_op.Equal
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            )
            (command.ShAssignment
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                (assign_pair
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                  op: assign_op.Equal
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                )
              ]
            )
          ]
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        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
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                  child: 
                    (command.DBracket
                      expr: 
                        (bool_expr.LogicalAnd
                          left: 
                            (bool_expr.Binary
                              op_id: Id.BoolBinary_GlobNEqual
                              left: {(DQ ($ Id.VSub_DollarName '$kprobe'))}
                              right: {<p> <Id.Lit_Colon ':'> <Id.Lit_Other '*'>}
                            )
                          right: 
                            (bool_expr.Binary
                              op_id: Id.BoolBinary_GlobNEqual
                              left: {(DQ ($ Id.VSub_DollarName '$kprobe'))}
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                            )
                        )
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (command.Simple
              words: [{<echo>} {(DQ <'ERROR: invalid kprobe definition (should start with p: or r:)'>)}]
              redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
            )
            (C {<usage>})
          ]
          spids: [825 854]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:krest)
          op: assign_op.Equal
          rhs: 
            {
              (braced_var_sub
                token: <Id.VSub_Name kprobe>
                suffix_op: 
                  (suffix_op.Unary
                    tok: <Id.VOp1_Pound '#'>
                    arg_word: {<Id.Lit_Other '*'> <':'>}
                  )
              )
            }
          spids: [907]
        )
      ]
    )
    (command.ShAssignment
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        (assign_pair
          lhs: (sh_lhs_expr.Name name:kname)
          op: assign_op.Equal
          rhs: 
            {
              (braced_var_sub
                token: <Id.VSub_Name krest>
                suffix_op: 
                  (suffix_op.Unary
                    tok: <Id.VOp1_DPercent '%%'>
                    arg_word: {<' '> <Id.Lit_Other '*'>}
                  )
              )
            }
          spids: [915]
        )
      ]
    )
    (C {<set>} {<-->} {($ Id.VSub_DollarName '$krest')})
    (command.If
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        (if_arm
          cond: 
            (condition.Shell
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                    (command.DBracket
                      expr: 
                        (bool_expr.LogicalOr
                          left: 
                            (bool_expr.Binary
                              op_id: Id.BoolBinary_GlobDEqual
                              left: {($ Id.VSub_Number '$2')}
                              right: {(DQ )}
                            )
                          right: 
                            (bool_expr.Binary
                              op_id: Id.BoolBinary_GlobDEqual
                              left: {($ Id.VSub_Number '$2')}
                              right: 
                                {<Id.Lit_Other '*'> <Id.Lit_Other '['> <Id.BoolBinary_GlobEqual '='> 
                                  <Id.Lit_Other '%'> (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\$'>) <Id.Lit_Other ']'> <Id.Lit_Other '*'>
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                            )
                        )
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:ktype)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (braced_var_sub
                        token: <Id.VSub_Name kprobe>
                        suffix_op: 
                          (suffix_op.Unary
                            tok: <Id.VOp1_DPercent '%%'>
                            arg_word: {<':'> <Id.Lit_Other '*'>}
                          )
                      )
                    }
                  spids: [964]
                )
              ]
            )
            (command.ShAssignment
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                (assign_pair
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                  op: assign_op.Equal
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                    {
                      (DQ ($ Id.VSub_DollarName '$ktype') <':'> ($ Id.VSub_DollarName '$kname') <' '> 
                        ($ Id.VSub_DollarName '$krest')
                      )
                    }
                  spids: [973]
                )
              ]
            )
          ]
          spids: [929 957]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
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                (command.Sentence
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                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (C {<echo>} 
              {
                (DQ <'kname: '> ($ Id.VSub_DollarName '$kname') <', kprobe: '> 
                  ($ Id.VSub_DollarName '$kprobe')
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              }
            )
          ]
          spids: [984 994]
        )
      ]
    )
    (command.AndOr
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      children: [
        (C {<cd>} {($ Id.VSub_DollarName '$tracing')})
        (C {<die>} 
          {
            (DQ <'ERROR: accessing tracing. Root user? Kernel has FTRACE?\n'> 
              <'    debugfs mounted? (mount -t debugfs debugfs /sys/kernel/debug)'>
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          }
        )
      ]
    )
    (C {<set>} {<-->} {($ Id.VSub_DollarName '$kprobe')})
    (command.ShAssignment
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          op: assign_op.Equal
          rhs: {($ Id.VSub_Number '$2')}
          spids: [1035]
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    )
    (command.If
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        (if_arm
          cond: 
            (condition.Shell
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                    (command.Pipeline
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                            {<grep>}
                            {<-w>}
                            {($ Id.VSub_DollarName '$fname')}
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                          redirects: [
                            (redir
                              op: <Id.Redir_Great '>'>
                              loc: (redir_loc.Fd fd:1)
                              arg: {<'/dev/null'>}
                            )
                            (redir
                              op: <Id.Redir_GreatAnd '2>&'>
                              loc: (redir_loc.Fd fd:2)
                              arg: {<1>}
                            )
                          ]
                          do_fork: T
                        )
                      ]
                      negated: T
                    )
                  ]
                )
              ]
            )
          action: [
            (command.Simple
              words: [
                {<echo>}
                {
                  (DQ <'ERROR: func '> ($ Id.VSub_DollarName '$fname') <' not in '> 
                    ($ Id.VSub_DollarName '$PWD') <'/available_filter_functions.'>
                  )
                }
              ]
              redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
            )
            (command.Simple
              words: [{<printf>} {(DQ <'Either it doesn\'t exist, or, it might be unsafe to kprobe. '>)}]
              redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
            )
            (command.Simple
              words: [{<echo>} {(DQ <'Exiting. Use -F to override.'>)}]
              redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
            )
            (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<1>})
          ]
          spids: [1038 1068]
        )
      ]
    )
    (command.If
      arms: [
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          cond: 
            (condition.Shell
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                  terminator: <Id.Op_Semi _>
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            )
          action: [
            (command.If
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                (if_arm
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                    )
                  action: [
                    (C {<echo>} 
                      {
                        (DQ <'Tracing kprobe '> ($ Id.VSub_DollarName '$kname') <' for '> 
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                    )
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                  spids: [1126 1136]
                )
              ]
              else_action: [
                (C {<echo>} 
                  {(DQ <'Tracing kprobe '> ($ Id.VSub_DollarName '$kname') <'. Ctrl-C to end.'>)}
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            )
          ]
          spids: [1112 1123]
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    (command.AndOr
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        (C {<die>} 
          {
            (DQ <'ERROR: ftrace may be in use by PID '> 
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          }
        )
      ]
    )
    (command.AndOr
      ops: [Id.Op_DPipe]
      children: [
        (command.Simple
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          redirects: [
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              op: <Id.Redir_Great '>'>
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          ]
          do_fork: T
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        (C {<die>} {(DQ <'ERROR: unable to write '> ($ Id.VSub_DollarName '$flock') <.>)})
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    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:wroteflock)
          op: assign_op.Equal
          rhs: {<1>}
          spids: [1211]
        )
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    )
    (command.Simple
      words: [{<echo>} {<nop>}]
      redirects: [(redir op:<Id.Redir_Great '>'> loc:(redir_loc.Fd fd:1) arg:{<current_tracer>})]
      do_fork: T
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    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: 
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                      children: [
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                          words: [{<echo>} {(DQ ($ Id.VSub_DollarName '$kprobe'))}]
                          redirects: [
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                              loc: (redir_loc.Fd fd:1)
                              arg: {<kprobe_events>}
                            )
                          ]
                          do_fork: T
                        )
                      ]
                      negated: T
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (command.Simple
              words: [
                {<echo>}
                {
                  (DQ <'ERROR: adding kprobe '> 
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                  )
                }
              ]
              redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
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            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
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                        (command.Sentence
                          child: (command.DParen child:<Id.Lit_ArithVarLike dmesg>)
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (command.Simple
                      words: [
                        {<echo>}
                        {
                          (DQ <'Last '> ($ Id.VSub_DollarName '$dmesg') 
                            <' dmesg entries (might contain reason):'>
                          )
                        }
                      ]
                      redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
                      do_fork: T
                    )
                    (command.Pipeline
                      children: [
                        (C {<dmesg>})
                        (C {<tail>} {<-> ($ Id.VSub_DollarName '$dmesg')})
                        (C {<sed>} {(SQ <'s/^/    /'>)})
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                      negated: F
                    )
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                  spids: [1258 1268]
                )
              ]
            )
            (C {<edie>} {(DQ <Exiting.>)})
          ]
          spids: [1226 1241]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
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                (command.Sentence
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                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (C {<cat>} {<'events/kprobes/'> ($ Id.VSub_DollarName '$kname') <'/format'>})
            (C {<edie>} {(DQ )})
          ]
          spids: [1312 1322]
        )
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        (if_arm
          cond: 
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          action: [
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                  cond: 
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                                  redirects: [
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                                      op: <Id.Redir_Great '>'>
                                      loc: (redir_loc.Fd fd:1)
                                      arg: 
                                        {<'events/kprobes/'> ($ Id.VSub_DollarName '$kname') 
                                          <'/filter'>
                                        }
                                    )
                                  ]
                                  do_fork: T
                                )
                              ]
                              negated: T
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                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [(C {<edie>} {(DQ <'ERROR: setting filter or -p. Exiting.'>)})]
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              ]
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          ]
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          cond: 
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                  terminator: <Id.Op_Semi _>
                )
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            )
          action: [
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
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                        (command.Sentence
                          child: 
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                                  redirects: [
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                                      op: <Id.Redir_Great '>'>
                                      loc: (redir_loc.Fd fd:1)
                                      arg: {<'options/stacktrace'>}
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                                  ]
                                  do_fork: T
                                )
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                              negated: T
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [(C {<edie>} {(DQ <'ERROR: enabling stack traces (-s). Exiting'>)})]
                  spids: [1396 1409]
                )
              ]
            )
          ]
          spids: [1383 1393]
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      arms: [
        (if_arm
          cond: 
            (condition.Shell
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                  child: 
                    (command.Pipeline
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                          words: [{<echo>} {<1>}]
                          redirects: [
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                              op: <Id.Redir_Great '>'>
                              loc: (redir_loc.Fd fd:1)
                              arg: {<'events/kprobes/'> ($ Id.VSub_DollarName '$kname') <'/enable'>}
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                          do_fork: T
                        )
                      ]
                      negated: T
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                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (C {<edie>} 
              {(DQ <'ERROR: enabling kprobe '> ($ Id.VSub_DollarName '$kname') <'. Exiting.'>)}
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          spids: [1423 1438]
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          cond: 
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                (command.Sentence
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                  terminator: <Id.Op_Semi _>
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          action: [
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                    (condition.Shell
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                        (command.Sentence
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                          terminator: <Id.Op_Semi _>
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                  action: [(C {<cat>} {<trace>})]
                  spids: [1479 1489]
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              ]
              else_action: [(C {<grep>} {<-v>} {(SQ <'^#'>)} {<trace>})]
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          ]
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