Hi there
I'm having some trouble with a cgi script. I'm getting the 'Premature End of Script Headers' error message and it's getting to be very frustrating.
This is a test script at present. The input_file variable will eventually be passed to the script via another one ... but for the moment its being invoked via redirection from a html page.
Basically, it runs an executable (a C program) using the input_file as input. It results in the generation of a number of text files.
When run locally from the command line, the executable program does print to STDOUT so I was wondering whether this may be causing my error. Anyway, this is the script as is (which by the way has been developed with the kind help from a perl monk already).

#!/usr/bin/perl

use strict;
use warnings;
use CGI qw/:standard/;

# Upload directory for  files

my $upload_dir = "uploadpath";

# Path to processing program

my $program = "path/processprogram";

my $input_file = "inputfile.txt";

die "Usage: $0 INPUT_FILENAME\n" unless $input_file;

die "Can't process '$upload_dir/$input_file': File does not exist!\n"
    unless -f "$upload_dir/$input_file";


# Create web page...

print header,
    start_html("Processing  file '$input_file' ..."), $/,
    h1("Processing file '$input_file' ..."), $/;

chdir $upload_dir;

open (PROG, "| $program") || die "Can't run '$program': $!\n";
print PROG "$input_file\n";
close(PROG);

print p("OK"), end_html();
[download]

Any comments, suggestions much appreciated