top
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top is a Terminal command used to display a list of running processes, similar to Activity Monitor. By default it shows CPU usage and CPU time, as well as number of threads and memory usage statistics.
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Examples
To show all the running processes:
top
To show all the running processes, sorted by CPU usage:
top -u
To show all the running processes, sorted by cumulative CPU usage (and just let it run...):
top -ca -u
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Man Page Excerpt
The top program periodically displays a list of processes on the system in sorted order. The default key for sorting is pid, but other keys can be used instead. Various output options are available.
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