io-buffering

How does IO buffering work in Ruby? How often is data flushed to the underlying stream when using the IO and File classes? How does this compare to OS buffering? What needs to be done to guarantee that given data has been written to disk, before confidently reading it back for processing? Casper The Ruby IO documentation is not 100% clear on how this buffering works, but this is what you can extract from the documentation: Ruby IO has its own internal buffer In addition to that the underlying operating system may or may not further buffer data. The relevant methods to look at: IO.flush :

I have Perl script which appends a new line to the existing file every 3 seconds. Also, there is a C++ application which reads from that file. The problem is that the application begins to read the file after the script is done and file handle is closed. To avoid this I want to flush after each line append, but I'm new to Perl and don't know how to do that. paxdiablo Try: use IO::Handle; $fh->autoflush; This was actually posted as a way of auto-flushing in an early question of mine , which asked about the universally accepted bad way of achieving this :-) TL/DR: use IO::Handle and the flush