Dear Masters,
I want to have a URL that **only when clicked** the CGI will be executed.

<a href=/myweb/cgi-bin/mycgi_long_running.cgi?name=param>Some Param</a
+>
[download]

With a single click the CGI will perform the following tasks:

1. Find the files related to the given parameters.
2. Archive them (through system call)
3. Start downloading for user

How to create the proper state for CGI script for that? I have the following cgi script but failed:

    use strict;
    use warnings;
    use CGI::Carp qw(fatalsToBrowser);
    use CGI qw/:standard/;
    my $query = CGI->new();
    

    my $file = "listoffiles_withdir.txt";
    
    my $searchkey = param('name');
    
     #untainting step skipped for briefness

    # Begin searching terms and ignoring case
    my @entries = `grep -i \"$searchkey\" $file`;
    chomp @entries;
    
    my  $outf = 'tempfile.txt';   # output file name
    open ( OUTFILE, '>>', $outf)
    
    foreach my $file (@entries}
       print OUTFILE "$file";
    }
    
    close(OUTFILE)
    
    # This phase takes may take a long time to do 
    # many files involved
    system("tar -cf out.tar -T $outf");

    # Next step, I'm stuck as how 
    # to let the web automatically download
    # when the archiving is complete
[download]