How can I set the Windows PATH variable from Perl?

Question

I need to set the an environment variable from within Perl. Ideally, I need to query a variable and then change it if it is not what is required. Specifically it is the PATH var

Answer 1

$ENV{PATH}?

Keep in mind that environment variables only affect subprocesses, however. You can't run a Perl program, change %ENV, and then see that change in the parent process -- the environment does not work that way.