Obviously you've gone to some effort, so full marks for supplying the source. Regrettably, it's rather unreadable without <code> tags.

It looks like you're using a backtick to grab some output, and mailing that. But you're not checking to see whether the command was successful or not.

Taking a wild stab in the dark, I would say that the command cleartool is not in the PATH, and you're failing to check what happens when you try to call it. Try amending your script as follows:

    @cmdOut = `$cmd`;
    # add this:
    if ($?) {
        die "argh: bad things happened: $?";
    }
[download]

At least that way if you'll know if the backticked command managed to run correctly. Get back to us when you've done that.