I'm going to assume you're trying to run something like crack and you're on a machine that has shadowed passwords.
You're going to have to make sure that the version of crack you have has an option to use the shadowed password file instead of the regular one. I also just realized that to have access to that, you're gonna have to be root because the shadow file is 0400, owned by root, group root (or something else just as restrictive).
We the willing, led by the unknowing, have been doing the impossible for the ungrateful. We have done so much with so little for so long that we are now qualified to do just about anything with almost nothing.
shadow & passwd
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