The anatomy of a command-line program

Running a command line program can be as simple as typing its name which can be as short as a single letter:

~ $ w
14:40  up 13 days,  3:20, 11 users, load averages: 5.06 4.65 4.50
USER     TTY      FROM              LOGIN@  IDLE WHAT
bobby    console  -                28Jan22 13days -
...

w is a program that tells you who’s logged in and what they’re doing

It’s rarely that simple, though. When a command involves running a program, it’s…