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The command "top -o mem" is used to monitor the processes and system resource usage on a Unix or Linux system.

Here's a breakdown of the command:

• "top" is a command-line utility that provides real-time information about the processes running on a system, CPU usage, memory usage, and other system statistics.
• "-o mem" is an option used to sort the displayed processes based on memory usage. The "o" flag stands for "order", and "mem" specifies that the sorting should be done by memory usage.

When you run the "top -o mem" command, the output will display a continuously-updating list of processes, with the process using the most memory at the top of the list. This can be helpful for identifying resource-intensive processes or troubleshooting system performance issues related to memory usage.