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/GNU Fortran 5

3.9 GFORTRAN_DEFAULT_RECL—Default record length for new files

This environment variable specifies the default record length, in bytes, for files which are opened without a RECL tag in the OPEN statement. This must be a positive integer. The default value is 1073741824 bytes (1 GB).

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https://gcc.gnu.org/onlinedocs/gcc-5.4.0/gfortran/GFORTRAN_005fDEFAULT_005fRECL.html