Shell Programming and Scripting

Hi Unix gurus,
I am facing a threading problem in Perl.
I have a worker thread in perl in which I am calling a shell script.
The shell script echo's output to the Standard Output from time to time as it progresses.

In the worker thread, I am unable to display the echo statement of shell script as and when it is echoed.
However, the thread prints the Standard Output of the shell script when the script ends.

Here is some code to demonstrate what i am trying to do:

Code:

 
@outputs=`shellscript 2>&1`  # This is where the script is called and its retutrned in the variable outputs
foreach my $output ( @outputs )
{
            print "WRKTH#$index = $output";
}

I want how I can print the 'outputs' as and when it is popuated.
Please also provide some sample code.
Please advise.
Thanks.

Your problem is that the backticks will spawn a subprocess which will exec(v) your command, collect the output and only then return. You'll be better of opening a filehandle for the process' output:

Code:

open my $FH, 'shellscript 2>&1 |' or die "Can't open process for reading: $!";
while(my $output=<$FH>)
...

See perldoc -f open for details.