Re: buffered output?

[Ramprasad A Padmanabhan]

Bryan Harris wrote:
I have an odd problem...

I have a perl script that execs another program:

$cmd = "motuds t1.dat t2.dat t3.dat > out1";
exec $cmd;
Motuds takes awhile to run, though, and I often want to see how it's doing:

% tail -f out1

The problem is, the output of motuds is not getting written out to the file
immediately.  Somehow it's getting cached somewhere, and only gets written
out once in a while.  If I type that command on the command line, the tail
command works properly.  So something with the exec process is causing the
output to be buffered.
Does anyone happen to know why?

TIA.

- Bryan


In the beginning of the perlscript  put

$|=1;

That is the simplest way of stopping bufferring on STDOUT.
( For no  bufferring on any other stream use select(HANDLE) ; $|=1 )
Or I think u could use some module like IO::File that has functions do that

Ram



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