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### 3.5 `GFORTRAN_UNBUFFERED_ALL`—Do not buffer I/O on all units

This environment variable controls whether all I/O is unbuffered. If the first letter is ‘`y`’, ‘`Y`’ or ‘`1`’, all I/O is unbuffered. This will slow down small sequential reads and writes. If the first letter is ‘`n`’, ‘`N`’ or ‘`0`’, I/O is buffered. This is the default.