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ps exists in Unix but doesn't list threads as you've found.
In Linux they decided to start listing the threads in standard ps output some time back (in fact I have one RHEL 3 system that does this and one that doesn't because they have slightly different 2.4 kernel versions). However in UNIX they don't do this.
It would depend a lot on which Unix variant you're using. For HP-UX (Hewlett Packard's UNIX variant) there is a utility called Glance that will show you thread information. There are likely others for other variants.