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/GNU Fortran 4

3.2 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.

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https://gcc.gnu.org/onlinedocs/gcc-4.9.3/gfortran/GFORTRAN_005fSTDIN_005fUNIT.html