Jason Gerfen wrote:
> Bowie Bailey wrote:
> > Jason Gerfen wrote:
> > > I am looking to do something which I am not sure perl can do. I
> > > would like to be able to issue a system command ex. tail -f /file
> > > and loop over that command while sorting the output. Is this
> > > possible? And if so could I see an example?
> >
> > open(LOG, "tail -f /var/log/messages |");
> > while (<LOG>) {
> > if (/something important/) {
> > print "Found something...\n";
> > }
> > }
> > close LOG; # Never get here, but for completeness...
> >
> > I'm not sure what you mean by sorting the output. Since there is
> > continuous input, there will be continuous output. You could sort
> > and display aggregated output at intervals rather than having a
> > real-time output stream.
>
> Really? So constantly piping the results of a log file through a
> function to sort the data is not the best method of giving real time
> data based on the piped output of a log file?
Sure, it just depends on exactly what you mean by "Sort the data". What
kind of output are you looking for?
I have a few programs that do this exact thing. They tail the log file
and page or email me when they find something. The only problem I have
had is that it seems like the pipe will eventually break if you leave it
running for long enough.
--
Bowie
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