There are three buffering states:

If a handle is buffered, line buffering is always and only used when the file handle is connected to a terminal.

So, if you're writing to a file, \n won't flush. But if you're writing to STDOUT and it hasn't been redirected, \n will flush if buffering wasn't turned off.

You can turn on buffering using 

use IO::Handle qw( );
FH->autoflush(0);

[download]

You can turn off buffering using 

use IO::Handle qw( );
FH->autoflush(1);

[download]

You can flush manually using 

use IO::Handle qw( );
FH->flush();

[download]

* — Well, I *think* the buffer size is 4KB.

In reply to Re^2: Increasing the write buffer by ikegami
in thread Increasing the write buffer by accassar

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