(command.CommandList
  children: [
    (C {<.>} {(${ Id.VSub_Name BACKEND) <'/functions.sh'>})
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:IMAGE_FILE)
          op: assign_op.Equal
          rhs: {(DQ (${ Id.VSub_Number 1))}
          spids: [90]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:DEVICE_FILE)
          op: assign_op.Equal
          rhs: {(DQ (${ Id.VSub_Number 2))}
          spids: [97]
        )
      ]
    )
    (C {<write_image>} {(DQ (${ Id.VSub_Name IMAGE_FILE))} {(DQ (${ Id.VSub_Name DEVICE_FILE))})
  ]
)