pstree shows running processes as a tree. The tree is rooted at either pid or init if pid is omitted. If a user name is specified, all process trees rooted at processes owned by that user are shown.

pstree visually merges identical branches by putting them in square
brackets and prefixing them with the repetition count, e.g.

init-+-getty
|-getty
|-getty
‘-getty

becomes

init—4*[getty]

Cheers
pavs