system is a perl built-in function, so you do not need any modules installed to have it available.

lockfile is part of your operating system software (well, that's not technically completely accurate, but close enough), so it has nothing to do with Perl in itself.

Back out of that alley you've gone down and look for the solution in another direction :). Your problem is most probably situated in different behaviour of lockfile between your original and current systems.

>>Your problem is most probably situated in different behaviour of lockfile between your original and current systems.

Besides Perl, all the other software (Apache, MySQL, PHP, etc, etc) on the previous website, was VERY old, ... well a considerable number of releases back.

Peter

lockfile(1) is part of the OS. system() is part of Perl. Neither are Perl modules. Regardless of your lack of understanding of what your code is doing to what and where your analysis of the required actions is correct.

Suggestion. SSH into the shell and deal with your server like a (man/woman/real hacker).