To view the amounts of free, used, and swap memory in the CentOS 7 operating system, what command should you use?
A)top
B)free
C)vmstat
D)watch free

Question

Quizplus · Accepted Answer

The "free" command is used to display the total amount of free and used physical and swap memory in the system. It also displays the buffers and cached memory in the system. The "top" command can also be used to view memory usage, but it primarily displays a real-time view of the system's processes, and may not provide as clear of a summary of memory usage as the "free" command. The "vmstat" command is used to display various statistics about the system's virtual memory usage, but does not provide a clear summary of free and used memory. The "watch free" command can be used to repeatedly display the "free" command output at regular intervals, but is not necessary for a one-time view of memory usage.

To View the Amounts of Free, Used, and Swap Memory