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Wiktionary
ps

init. (alternative form of PS lang=en nodot=1) (gloss: post scriptum). n. (plural of p English)

Wikipedia
PS

PS, P.S., ps, and other variants may refer to:

Ps (Unix)

In most Unix-like operating systems, the ps program (short for "process status") displays the currently-running processes. A related Unix utility named top provides a real-time view of the running processes.

In Windows PowerShell, ps is a predefined command alias for the Get-Process cmdlet, which essentially serves the same purpose.