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Deciphering the terminal

August 27, 2018

My goal is to be a competent command line programmer.

I knew that in order to make that happen, I would have to get very comfortable reading guides that are not geared toward novices at all.

In fact, it’s pretty amazing how nearly everyone assumes some knowledge of the command line when they’re teaching about the command line.

It’s worth noting that I find myself in this boat now too after only a few short weeks.

What do I mean?

When a command is written as $ cd <directory> every part of that will be confusing to someone who’s never had anyone explain the syntax of a command.

Let’s start at the beginning - the $ -> All this means is that everything that you see in your terminal before this… can be ignored.

For example, if the command that you’re told to run is $ cd ~/, then the person typing it will see something like this:

Reading through that first line, piece by piece, here’s how I play out a conversation with my computer to understand what’s going on:

Me: “Hey computer, what’s Stephens-MBP?”

Computer: “That’s the name of your computer”

Me: “And what about Documents?”

Computer: “Documents is the current directory. If you think about opening Finder, it’s as if you’ve navigated to your documents folder. From here, we have access to all of the files and directories inside.” img1

Me: “Why does it say my name, Stephen?”

Computer: “That is your user name.”

Me: “Okay, and what about the $?”

Computer: “Everything up to this point was just telling you where you are, the $ separates that from the command that you now want to execute.”

Me: “Ah, so the cd ~/ is a command?

Computer: “Exactly. It’s a command to change directory. In this case, you have specified to change the directory to ~/, which really means the home directory of the root drive. In your case it will be /Users/Stephen/.”

More to come…


Stephen Weiss

Thanks for reading! My name's Stephen Weiss. I live in Chicago with my wife, Kate, and dog, Finn.
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