List all processes

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There are two common ways to list all processes on a system. Both list all processes running by all users, though they differ in the format they output (the reason for the differences are historical).

ps -ef   # lists all processes 
ps aux   # lists all processes in alternative format (BSD)

This can be used to check if a given application is running. For example, to check if the SSH server (sshd) is running:

ps -ef | grep sshd

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