! Demonstrates PetscViewerASCIIOpenWithFileUnit()
#include <petsc/finclude/petscsys.h>
program main
  use petscmpi  ! or mpi or mpi_f08
  use petscsys

  implicit none
  PetscErrorCode :: ierr
  PetscViewer    :: viewer
  integer :: unit

  ! Every PETSc program should begin with the PetscInitialize() routine.
  PetscCallA(PetscInitialize(ierr))

  unit = 6
  PetscCallA(PetscViewerASCIIOpenWithFileUnit(PETSC_COMM_WORLD, unit, viewer, ierr))
  PetscCallA(PetscOptionsView(PETSC_NULL_OPTIONS, viewer, ierr))
  PetscCallA(PetscViewerDestroy(viewer, ierr))
  PetscCallA(PetscFinalize(ierr))
end program main

!/*TEST
!
!   test:
!     args: -options_view -options_left no
!
!TEST*/