Is ComLine.pl executable?

What is the value of $! after the failed call? 
exec('ComLine.pl', @args ) or die "Can't exec: $!";

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Aside, you'll generally want to use system rather than exec because exec never returns. Instead, it replaces the currently running program with the program passed as the first parameter.

If you have any code that follows the call to exec, you should use system instead.

Please see perlfunc for details about the return values from exec and system.

--sacked

In reply to Re: Exec() argument format by sacked
in thread Exec() argument format by MonkPaul

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