in addition to whatever buffering the operating system may or may not do.

The OS may delay writing it to disk a little after receiving it, but it will appear to be on the disk to anyone trying to read the file immediately after Perl sends it to the OS.

That means that if you you use flush or autoflush to send the data to the OS, it will be immediately available to everyone, though the data could be lost if a power outage occurs shortly after.

In reply to Re^3: how many chars/bytes does STDOUT buffer by ikegami
in thread how many chars/bytes does STDOUT buffer by sandy105

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