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        (command.Sentence
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                  fd: -1
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                    ('                 -h              # this usage message\n')
                    ('                 -H              # include column headers\n')
                    ('                 -p PID          # trace when this pid is on-CPU\n')
                    ('                 -L TID          # trace when this thread is on-CPU\n')
                    ('  eg,\n')
                    ('       functrace do_nanosleep    # trace the do_nanosleep() function\n')
                    ("       functrace '*sleep'        # trace functions ending in ")
                    (Id.Right_DoubleQuote '"')
                    (sleep)
                    (Id.Right_DoubleQuote '"')
                    ('\n')
                    ("       functrace -p 198 'vfs*'   # trace ")
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                    ('vfs*')
                    (Id.Right_DoubleQuote '"')
                    (' funcs for PID 198\n')
                    ("       functrace 'tcp*' > out    # trace all ")
                    (Id.Right_DoubleQuote '"')
                    ('tcp*')
                    (Id.Right_DoubleQuote '"')
                    (' funcs to out file\n')
                    ("       functrace -d 1 'tcp*' > out  # trace 1 sec, then write out file\n")
                    ('\n')
                    ('See the man page and example file for more info.\n')
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                (C {(warn)} {(DQ ('echo > set_ftrace_pid'))})
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            (C {(warn)} {(DQ ('echo > set_ftrace_filter'))})
            (C {(warn)} {(DQ ('echo > trace'))})
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                (C {(warn)} {(DQ ('rm ') ($ Id.VSub_DollarName '$flock'))})
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    (command.ShFunction
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        (word_part.ArithSub
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        (C {(usage)})
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              right: (arith_expr.VarRef token:(Token id:Id.Lit_ArithVarLike val:opt_tid span_id:598))
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        (C {(edie)} {(DQ ('ERROR: You can use -p or -L but not both.'))})
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    (command.ShAssignment
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        (command.ShAssignment
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              terminator: (Token id:Id.Op_Semi val:';' span_id:654)
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          action: [
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    )
    (command.AndOr
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          {
            (DQ ('ERROR: accessing tracing. Root user? Kernel has FTRACE?\n') 
              ('    debugfs mounted? (mount -t debugfs debugfs /sys/kernel/debug)')
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      ]
    )
    (command.AndOr
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      children: [
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        (C {(die)} 
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            (DQ ('ERROR: ftrace may be in use by PID ') 
              (command_sub
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        )
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    )
    (command.AndOr
      ops: [Id.Op_DPipe]
      children: [
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              arg_word: {($ Id.VSub_DollarName '$flock')}
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        )
        (C {(die)} {(DQ ('ERROR: unable to write ') ($ Id.VSub_DollarName '$flock') (.))})
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    )
    (command.ShAssignment
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        (assign_pair
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          op: assign_op.Equal
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    )
    (C {(sysctl)} {(-q)} {(kernel.ftrace_enabled) (Id.Lit_Equals '=') (1)})
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      words: [{(read)} {(mode)}]
      redirects: [
        (redir.Redir
          op: (Token id:Id.Redir_Less val:'<' span_id:772)
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        (C {(edie)} 
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              terminator: (Token id:Id.Op_Semi val:';' span_id:808)
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          action: [
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              redirects: [
                (redir.Redir
                  op: (Token id:Id.Redir_Great val:'>' span_id:815)
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            (command.ForEach
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              iter_words: [{(/proc/) ($ Id.VSub_DollarName '$pid') (/task/) (Id.Lit_Star '*')}]
              do_arg_iter: F
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                                          (braced_var_sub
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                                  negated: T
                                )
                              terminator: (Token id:Id.Op_Semi val:';' span_id:855)
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                          ]
                          action: [
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                              {
                                (DQ ('ERROR: setting -p ') ($ Id.VSub_DollarName '$pid') 
                                  (' (PID exist?). Exiting.')
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                            )
                          ]
                          spids: [839 857]
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                    )
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                )
            )
          ]
          spids: [800 810]
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          action: [
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                          negated: T
                        )
                      terminator: (Token id:Id.Op_Semi val:';' span_id:900)
                    )
                  ]
                  action: [
                    (C {(edie)} 
                      {
                        (DQ ('ERROR: setting -L ') ($ Id.VSub_DollarName '$tid') 
                          (' (TID exist?). Exiting.')
                        )
                      }
                    )
                  ]
                  spids: [889 902]
                )
              ]
            )
          ]
          spids: [876 886]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: 
                (command.Pipeline
                  children: [
                    (command.Simple
                      words: [{(echo)} {(DQ ($ Id.VSub_DollarName '$funcs'))}]
                      redirects: [
                        (redir.Redir
                          op: (Token id:Id.Redir_Great val:'>' span_id:928)
                          fd: -1
                          arg_word: {(set_ftrace_filter)}
                        )
                      ]
                    )
                  ]
                  negated: T
                )
              terminator: (Token id:Id.Op_Semi val:';' span_id:931)
            )
          ]
          action: [
            (C {(edie)} 
              {
                (DQ ('ERROR: enabling ') 
                  (word_part.EscapedLiteral
                    token: (Token id:Id.Lit_EscapedChar val:'\\"' span_id:940)
                  ) ($ Id.VSub_DollarName '$funcs') 
                  (word_part.EscapedLiteral
                    token: (Token id:Id.Lit_EscapedChar val:'\\"' span_id:942)
                  ) ('. Exiting.')
                )
              }
            )
          ]
          spids: [918 933]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: 
                (command.Pipeline
                  children: [
                    (command.Simple
                      words: [{(echo)} {(Id.KW_Function function)}]
                      redirects: [
                        (redir.Redir
                          op: (Token id:Id.Redir_Great val:'>' span_id:956)
                          fd: -1
                          arg_word: {(current_tracer)}
                        )
                      ]
                    )
                  ]
                  negated: T
                )
              terminator: (Token id:Id.Op_Semi val:';' span_id:959)
            )
          ]
          action: [
            (C {(edie)} 
              {
                (DQ ('ERROR: setting current_tracer to ') 
                  (word_part.EscapedLiteral
                    token: (Token id:Id.Lit_EscapedChar val:'\\"' span_id:968)
                  ) (function) (word_part.EscapedLiteral token:(Token id:Id.Lit_EscapedChar val:'\\"' span_id:970)) 
                  ('. Exiting.')
                )
              }
            )
          ]
          spids: [948 961]
        )
      ]
    )
    (C {(warn)} {(DQ ('echo > trace'))})
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: 
                (command.DParen
                  child: 
                    (arith_expr.VarRef
                      token: (Token id:Id.Lit_ArithVarLike val:opt_duration span_id:990)
                    )
                )
              terminator: (Token id:Id.Op_Semi val:';' span_id:994)
            )
          ]
          action: [
            (C {(sleep)} {($ Id.VSub_DollarName '$duration')})
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.DParen
                          child: 
                            (arith_expr.VarRef
                              token: (Token id:Id.Lit_ArithVarLike val:opt_headers span_id:1008)
                            )
                        )
                      terminator: (Token id:Id.Op_Semi val:';' span_id:1012)
                    )
                  ]
                  action: [(C {(cat)} {(trace)})]
                  spids: [1004 1014]
                )
              ]
              else_action: [
                (C {(grep)} {(-v)} {(SQ (Token id:Id.Lit_Chars val:'^#' span_id:1030))} {(trace)})
              ]
            )
          ]
          spids: [986 996]
        )
      ]
      else_action: [
        (command.AndOr
          ops: [Id.Op_DAmp]
          children: [
            (command.DParen
              child: 
                (arith_expr.VarRef
                  token: (Token id:Id.Lit_ArithVarLike val:opt_headers span_id:1047)
                )
            )
            (C {(cat)} {(trace)})
          ]
        )
        (C {(cat)} {(trace_pipe)})
      ]
    )
    (C {(end)})
  ]
)