There are several issues with your code:

• You have neither used strict nor warnings
• You have two while(1) loops, only one of which has a last statement. Your program won't terminate unless you kill it.
• Your next statements aren't in the scope of any loop. Although next can be used to exit a sub called in a loop (and I'm quite surprised it works), I'm not sure if it is safe, and I'm certain that it is not clear. Also, warnings would have warned you about this. You can use return instead, although it looks like you just copied the example from Parallel::ForkManager without understanding it.
• $fork is never set, so the value transmitted to "new" is undef, interpreted as 0. The documentation states "If you specify 0 (zero), then no children will be forked". So ForkManager isn't doing what you think it does.
• You can probably remove half the use statements.
• As far as I know, all your undef calls are useless, because the variables are implicitly freed when their scope is exited.
• You don't have comments, and you didn't explain what your program is supposed to do.
• One letter variables should be avoided (they can have special meanings), $fuck as well.

Please read How do I post a question effectively?

It looks like you want to call another perl program on a list of files. You should turn that program into a module, with one exported function, and call that function on your files, rather than spawn a new process with system. You'll find some information on modules in the perlmod documentation and in tutorials like this one

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