..
  Copyright 1988-2021 Free Software Foundation, Inc.
  This is part of the GCC manual.
  For copying conditions, see the GPL license file

.. _gfortran_stdin_unit:

GFORTRAN_STDIN_UNIT---Unit number for standard input
****************************************************

This environment variable can be used to select the unit number
preconnected to standard input.  This must be a positive integer.
The default value is 5.