The bash man page has long had the following bug listed: "It's too big and too slow" (at the very bottom of the man page). If you agree with that, then you probably won't want to read about the "new" ...

Command interpreters and scripting languages like the Bash shell are essential tools of any operating system. Here's how to use powerful data structures in Bash called associative arrays or hashes.

That leaves the usernames separated by a space. Since bash likes to treat spaces in variables as a newline, we exploit that to get an array of admin users on the mac.

This is really all about arrays, and in a shell script, arrays are easy to work with: simply specify the needed index in the array, and it'll be allocated so that it's a valid slot. For example, I ...