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CALL Flush(Unit)
Unit: INTEGER; OPTIONAL; scalar; INTENT(IN).
Intrinsic groups: unix.
Description:
Flushes Fortran unit(s) currently open for output. Without the optional argument, all such units are flushed, otherwise just the unit specified by Unit.
Some non-GNU implementations of Fortran provide this intrinsic as a library procedure that might or might not support the (optional) Unit argument.