(command.CommandList
  children: [
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:BASE64_ENC)
          op: assign_op.Equal
          rhs: 
            {
              (command_sub
                left_token: <Id.Left_DollarParen '$('>
                command_list: 
                  (command.CommandList
                    children: [
                      (command.Pipeline
                        children: [
                          (C {<cat>} {<nrconfig.env>})
                          (C {<base64>})
                          (C {<tr>} {<-d>} {(SQ <'\\n'>)})
                        ]
                        negated: F
                      )
                    ]
                  )
              )
            }
          spids: [48]
        )
      ]
    )
    (command.Simple
      words: [
        {<sed>}
        {<-e>}
        {(DQ <'s#{{config_data}}#'> (${ Id.VSub_Name BASE64_ENC) <'#g'>)}
        {<./newrelic-config-template.yaml>}
      ]
      redirects: [(redir.Redir op:<Id.Redir_Great '>'> fd:-1 arg_word:{<newrelic-config.yaml>})]
    )
  ]
)