unix command thread status similar to ps

Is there a unix command to display thread status which is similar to ps which display process status?

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.