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In most Unix-like operating systems, the ps command line program gives a snapshot of the currently running processes, including ps itself.
ps has many options, though it is commonly run with the options -ef, where "-e" selects all processes and "-f" chooses the "full" output format.
Some less-standard systems do not accept the above. On such systems, ps is commonly used with the non-standard options aux, where "a" lists all processes on a terminal, including those of other users, "x" lists all processes without controlling terminals and "u" adds the controlling user for each process. Note that, for maximum compatibility when using this syntax, there is no "-" in front of the "aux".
For a real-time view of processes, see top.
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