FILE OFLU is a CAOS command to do with I/O.
Usage[]
Syntax: FILE OFLU
Flushes the output stream. Data in the output stream may not be sent immediately, but may build up a little (be buffered) before being written to wherever it should go. FILE OFLU forces it to be written immediately.
If writing to a journal file with FILE OOPE the buffer will be written to disk immediately (although it may then wait in the operating system's disk buffer...)
 This article about a CAOS command or function needs further examples.
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