Try ps or ps -A for a process list.
Try top for a screen (refreshed every few seconds) to the processes using the "top" amount resources.
Append a --help option for a syntax list, and man ps (or man top) for more info.
Also man -K <topic> will list available commands with <topic> in their keyword lists, an info --apropos <topic> will do a similar search of the info files.
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