How to find memory usage by process?

As Linux system administrators, you take pride in being able to setup and maintain systems from the command line. But learning is never ending, and new tasks require a bit of research to find the correct tool for the job. Knowing more command line tools as you grow more experienced is a character that becomes evident in any seasoned veteran admin. One of those commands is to find memory usage by process.

Finding the processes that use most memory seems like ...