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      name: usage
      body: 
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          left: <Id.Lit_LBrace '{'>
          children: [
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              blame_tok: <echo>
              more_env: []
              words: [
                {<echo>}
                {(DQ <'usage: '> ($ Id.VSub_Number 0) <' <directory of files to execute>'>)}
              ]
              redirects: [(Redir op:<Id.Redir_GreatAnd '1>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
            )
            (command.Simple
              blame_tok: <echo>
              more_env: []
              words: [
                {<echo>}
                {(DQ <'or     '> ($ Id.VSub_Number 0) <' { daily | weekly | monthly | security }'>)}
              ]
              redirects: [(Redir op:<Id.Redir_GreatAnd '1>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
            )
            (command.ControlFlow keyword:<Id.ControlFlow_Exit exit> arg_word:{<1>})
          ]
          redirects: []
          right: <Id.Lit_RBrace '}'>
        )
    )
    (command.ShFunction
      name_tok: <output_pipe>
      name: output_pipe
      body: 
        (BraceGroup
          left: <Id.Lit_LBrace '{'>
          children: [
            (command.Simple
              blame_tok: <eval>
              more_env: []
              words: [
                {<eval>}
                {<Id.Lit_VarLike 'output='> 
                  (word_part.EscapedLiteral
                    token: <Id.Lit_EscapedChar '\\$'>
                    ch: '$'
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                  (BracedVarSub
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                    token: <Id.VSub_Number 1>
                    var_name: 1
                    suffix_op: 
                      (suffix_op.Unary
                        op: <Id.VOp1_DPound '##'>
                        arg_word: {<Id.Lit_Other '*'> <Id.Lit_Slash '/'>}
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                }
              ]
              redirects: []
              do_fork: T
            )
            (command.Case
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              to_match: (case_arg.Word w:{(DQ ($ Id.VSub_DollarName output))})
              arms_start: <Id.KW_In in>
              arms: [
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                  pattern: (pat.Words words:[{<'/'> <Id.Lit_Star '*'>}])
                  middle: <Id.Right_CasePat _>
                  action: [
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                      pairs: [
                        (AssignPair
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                          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'pipe='> name:pipe)
                          op: assign_op.Equal
                          rhs: {(DQ <'cat >>'> ($ Id.VSub_DollarName output))}
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                      ]
                      redirects: []
                    )
                  ]
                  right: <Id.Op_DSemi _>
                )
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                  pattern: (pat.Words words:[{(DQ )}])
                  middle: <Id.Right_CasePat _>
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                      pairs: [
                        (AssignPair
                          left: <Id.Lit_VarLike 'pipe='>
                          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'pipe='> name:pipe)
                          op: assign_op.Equal
                          rhs: {<cat>}
                        )
                      ]
                      redirects: []
                    )
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                )
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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 'pipe='> name:pipe)
                          op: assign_op.Equal
                          rhs: 
                            {
                              (DQ <'mail -E -s \''> ($ Id.VSub_DollarName host) <' '> 
                                (${ Id.VSub_Number 2) 
                                (BracedVarSub
                                  left: <Id.Left_DollarBrace '${'>
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                                  var_name: 2
                                  suffix_op: 
                                    (suffix_op.Unary
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                                      arg_word: {<' '>}
                                    )
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                                ) 
                                (BracedVarSub
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                                  token: <Id.VSub_Number 1>
                                  var_name: 1
                                  suffix_op: 
                                    (suffix_op.Unary
                                      op: <Id.VOp1_DPound '##'>
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                                  right: <Id.Right_DollarBrace '}'>
                                ) <' run output\' '> ($ Id.VSub_DollarName output)
                              )
                            }
                        )
                      ]
                      redirects: []
                    )
                  ]
                  right: <Id.Op_DSemi _>
                )
              ]
              arms_end: <Id.KW_Esac esac>
              redirects: []
            )
            (command.Simple
              blame_tok: <eval>
              more_env: []
              words: [{<eval>} {($ Id.VSub_DollarName pipe)}]
              redirects: []
              do_fork: T
            )
          ]
          redirects: []
          right: <Id.Lit_RBrace '}'>
        )
    )
    (command.If
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      arms: [
        (IfArm
          keyword: <Id.KW_If if>
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            (condition.Shell
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                    (command.Simple
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                      more_env: []
                      words: [
                        {<Id.Lit_LBracket '['>}
                        {($ Id.VSub_Pound '#')}
                        {<-lt>}
                        {<1>}
                        {<Id.Lit_RBracket ']'>}
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                      redirects: []
                      do_fork: T
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          then_kw: <Id.KW_Then then>
          action: [
            (command.Simple
              blame_tok: <usage>
              more_env: []
              words: [{<usage>}]
              redirects: []
              do_fork: T
            )
          ]
          spids: [159 173]
        )
      ]
      else_action: []
      fi_kw: <Id.KW_Fi fi>
      redirects: []
    )
    (command.If
      if_kw: <Id.KW_If if>
      arms: [
        (IfArm
          keyword: <Id.KW_If if>
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: 
                    (command.Simple
                      blame_tok: <Id.Lit_LBracket '['>
                      more_env: []
                      words: [
                        {<Id.Lit_LBracket '['>}
                        {<-r>}
                        {<'/etc/defaults/periodic.conf'>}
                        {<Id.Lit_RBracket ']'>}
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                      redirects: []
                      do_fork: T
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          then_kw: <Id.KW_Then then>
          action: [
            (command.Simple
              blame_tok: <.>
              more_env: []
              words: [{<.>} {<'/etc/defaults/periodic.conf'>}]
              redirects: []
              do_fork: T
            )
            (command.Simple
              blame_tok: <source_periodic_confs>
              more_env: []
              words: [{<source_periodic_confs>}]
              redirects: []
              do_fork: T
            )
          ]
          spids: [187 198]
        )
      ]
      else_action: []
      fi_kw: <Id.KW_Fi fi>
      redirects: []
    )
    (command.ShAssignment
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      pairs: [
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          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'host='> name:host)
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          rhs: 
            {
              (CommandSub
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                  (command.Simple
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                    more_env: []
                    words: [{<hostname>}]
                    redirects: []
                    do_fork: T
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        )
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      redirects: []
    )
    (command.Simple
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      more_env: []
      words: [{<export>} {<host>}]
      redirects: []
      do_fork: T
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        (IfArm
          keyword: <Id.KW_If if>
          cond: 
            (condition.Shell
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                      more_env: []
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                        {($ Id.VSub_Number 1)}
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                      redirects: []
                      do_fork: T
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          action: [
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              redirects: []
            )
            (command.ForEach
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              iter_names: [arg]
              iterable: (for_iter__Args)
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                                right: <Id.Right_DollarBrace '}'>
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                        )
                      ]
                      redirects: []
                    )
                    (command.Simple
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                      more_env: []
                      words: [
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                        {<-t>}
                        {<0>}
                        {(DQ (${ Id.VSub_Name lockfile))}
                        {<'/bin/sh'>}
                        {($ Id.VSub_Number 0)}
                        {<LOCKED>}
                        {(DQ ($ Id.VSub_DollarName arg))}
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                      redirects: []
                      do_fork: T
                    )
                    (command.Case
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                      to_match: (case_arg.Word w:{($ Id.VSub_QMark '?')})
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                        )
                        (CaseArm
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                          middle: <Id.Right_CasePat _>
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                                (command.Simple
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                                  more_env: []
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                                  do_fork: T
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                                (command.Simple
                                  blame_tok: <output_pipe>
                                  more_env: []
                                  words: [
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                                    {($ Id.VSub_DollarName arg)}
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                                  redirects: []
                                  do_fork: T
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                              ops: [<Id.Op_Pipe _>]
                            )
                            (command.ShAssignment
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                              pairs: [
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                                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'ret='> name:ret)
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                                  rhs: {<1>}
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                              redirects: []
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                          right: <Id.Op_DSemi _>
                        )
                        (CaseArm
                          left: <75>
                          pattern: (pat.Words words:[{<75>}])
                          middle: <Id.Right_CasePat _>
                          action: [
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                              children: [
                                (command.Simple
                                  blame_tok: <echo>
                                  more_env: []
                                  words: [
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                                    {
                                      (DQ ($ Id.VSub_DollarName host) <' '> 
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                                          right: <Id.Right_DollarBrace '}'>
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                                  redirects: []
                                  do_fork: T
                                )
                                (command.Simple
                                  blame_tok: <output_pipe>
                                  more_env: []
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                                    {($ Id.VSub_DollarName arg)}
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                                  redirects: []
                                  do_fork: T
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                              ops: [<Id.Op_Pipe _>]
                            )
                            (command.ShAssignment
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                              redirects: []
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                        (CaseArm
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                              redirects: []
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                          right: <Id.Op_DSemi _>
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                      arms_end: <Id.KW_Esac esac>
                      redirects: []
                    )
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              redirects: []
            )
            (command.ControlFlow
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          spids: [238 254]
        )
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      else_action: []
      fi_kw: <Id.KW_Fi fi>
      redirects: []
    )
    (command.If
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          cond: 
            (condition.Shell
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                      more_env: []
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                        {($ Id.VSub_Pound '#')}
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                        {<2>}
                        {<Id.Lit_RBracket ']'>}
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                      redirects: []
                      do_fork: T
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            )
          then_kw: <Id.KW_Then then>
          action: [
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              more_env: []
              words: [{<usage>}]
              redirects: []
              do_fork: T
            )
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          spids: [417 430]
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      else_action: []
      fi_kw: <Id.KW_Fi fi>
      redirects: []
    )
    (command.Simple blame_tok:<shift> more_env:[] words:[{<shift>}] redirects:[] do_fork:T)
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      pairs: [
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          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'arg='> name:arg)
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          rhs: {($ Id.VSub_Number 1)}
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      redirects: []
    )
    (command.If
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      arms: [
        (IfArm
          keyword: <Id.KW_If if>
          cond: 
            (condition.Shell
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                    (command.Simple
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                      more_env: []
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                        {<-z>}
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                      redirects: []
                      do_fork: T
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          then_kw: <Id.KW_Then then>
          action: [
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              more_env: []
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                          {
                            (BracedVarSub
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                              right: <Id.Right_DollarBrace '}'>
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                        redirects: []
                        do_fork: T
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                    right: <Id.Backtick_Right '`'>
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              ]
              redirects: []
              do_fork: T
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          ]
          spids: [443 457]
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      ]
      else_action: []
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      redirects: []
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      arms: [
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          keyword: <Id.KW_If if>
          cond: 
            (condition.Shell
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                      more_env: []
                      words: [{<tty>}]
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          then_kw: <Id.KW_Then then>
          action: [
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              more_env: []
              words: [{<export>} {<Id.Lit_VarLike 'PERIODIC_IS_INTERACTIVE='> <1>}]
              redirects: []
              do_fork: T
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          spids: [479 491]
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      ]
      else_action: []
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      redirects: []
    )
    (command.ShAssignment
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      pairs: [
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                        (BracedVarSub
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                    redirects: []
                    do_fork: T
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      ]
      redirects: []
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    (command.ShAssignment
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      redirects: []
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    (command.Simple
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      more_env: []
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      redirects: []
      do_fork: T
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                                  redirects: []
                                )
                                (command.ShAssignment
                                  left: <Id.Lit_VarLike 'plural='>
                                  pairs: [
                                    (AssignPair
                                      left: <Id.Lit_VarLike 'plural='>
                                      lhs: 
                                        (sh_lhs_expr.Name
                                          left: <Id.Lit_VarLike 'plural='>
                                          name: plural
                                        )
                                      op: assign_op.Equal
                                      rhs: {<s>}
                                    )
                                  ]
                                  redirects: []
                                )
                              ]
                              ops: [<Id.Op_DAmp _> <Id.Op_DPipe _>]
                            )
                            (command.Simple
                              blame_tok: <echo>
                              more_env: []
                              words: [
                                {<echo>}
                                {
                                  (DQ <'No output from the '> ($ Id.VSub_DollarName processed) 
                                    <' file'> ($ Id.VSub_DollarName plural) <' processed'>
                                  )
                                }
                              ]
                              redirects: []
                              do_fork: T
                            )
                          ]
                          spids: [986 999]
                        )
                      ]
                      else_action: []
                      fi_kw: <Id.KW_Fi fi>
                      redirects: []
                    )
                  ]
                  spids: [970 983]
                )
              ]
              else_kw: <Id.KW_Else else>
              else_action: [
                (command.Simple
                  blame_tok: <echo>
                  more_env: []
                  words: [{<echo>} {(DQ )}]
                  redirects: []
                  do_fork: T
                )
                (command.Simple
                  blame_tok: <echo>
                  more_env: []
                  words: [{<echo>} {(DQ <'-- End of '> ($ Id.VSub_DollarName arg) <' output --'>)}]
                  redirects: []
                  do_fork: T
                )
              ]
              fi_kw: <Id.KW_Fi fi>
              redirects: []
            )
          ]
          redirects: []
          right: <Id.Lit_RBrace '}'>
        )
        (command.Simple
          blame_tok: <output_pipe>
          more_env: []
          words: [{<output_pipe>} {($ Id.VSub_DollarName arg)} {(DQ ($ Id.VSub_DollarName context))}]
          redirects: []
          do_fork: T
        )
      ]
      ops: [<Id.Op_Pipe _>]
    )
    (command.Simple
      blame_tok: <rm>
      more_env: []
      words: [{<rm>} {<-f>} {($ Id.VSub_DollarName tmp_output)}]
      redirects: []
      do_fork: T
    )
    (command.Simple
      blame_tok: <rm>
      more_env: []
      words: [{<rm>} {<-f>} {($ Id.VSub_DollarName PERIODIC_ANTICONGESTION_FILE)}]
      redirects: []
      do_fork: T
    )
  ]
)