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1.What would be displayed as the result of issuing the command ps ef?

A listing of the users running processes formatted as a tree.
A listing of the stopped processes.
A listing of all the running processes formatted as a tree.
A listing of all system processes formatted as a tree.

Explanation: Without any options, the ps command displays the running processes associated with the current user ID. The e option displays the processes' environment and the f option displays the processes in a tree format, illustrating the relationship between parent and child relationships.

Reference: http://www.oreillynet.com/linux/cmd/p/ps.html

Incorrect Answers
B: Only the running processes are listed, not the stopped processes.
C: You would need the a option to display all the running processes.
D: Only the user processes are listed, not the system processes.

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