Question

you know a linux command will perform a desired function for you, but you cannot remember the full name of the command. you do remember it will flush a variable from your system. which command typed at a command prompt displays a list of commands that would likely contain the command you desire?
a. man -k flush
b. man -k find all
c. man flush
d. man -key flush

Explanation:

The man -k command in Linux is the whatis equivalent. It searches for the given keyword in the short descriptions of all available commands. In this case, searching for "flush" with man -k flush will display a list of commands likely containing the desired command. The other options are incorrect as man -k find all is searching for "find all" not related to the flush - variable operation here, man flush will just show the manual for a command named "flush" (if exists) and man -key flush is an incorrect option usage.

Answer:

A. man -k flush