Pstree

pstree is a Unix command that shows the running processes as a tree. It is used as a more visual alternative to the ps command. The root of the tree is either init or the process with the given pid. ...
Found on http://en.wikipedia.org/wiki/Pstree

pstree

Display a tree of processes, see Section 4.1.4.
Found on http://www.tldp.org/LDP/intro-linux/html/gloss.html
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