If you think about how you usually use a computer, you probably navigate to a file by clicking on directories and open a program or file by double clicking on them. When you are programming a computer, you often need to run programs and send them options, called arguments, which is nearly impossible to do with only a click.
Because of this, every operating system contains a Command Line Interface (CLI) that lets you interact with your computer using a keyboard. You can do everything you already do on a computer via the command line, but you can also do a whole lot more!
Both command line tools start every line with a prompt that shows the current working directory of the command line tool. By default, both Windows and Mac starts you off in the base folder for your user account. The syntax varies only slightly between the two (assuming a user named Karle), so the initial prompt should be one of the following:
When using the command line, you are always “inside” of one specific folder (much like when you double-click a folder you see the contents of everything in that folder and only that folder). The current folder that your command line tool is in is referred to as the current working directory.
In Data Science Discovery, we recommend that you work within a directory called
stat430 on your desktop. In order to navigate to that directory, we need to first navigate to your Desktop and then navigate to the
stat430 directory. Both of these things can be done with the cd command (cd for “change directory”):
cd Desktop cd stat430
You can visually verify that you are now in your Stat 430 directory by looking at the prompt:
When using a command line tool, you often want to know what files are in your current working directory. To list all files in the current directory:
In addition to moving “forward” or “deeper” into your directories, the special cd .. will change your directory “up” one directory.
stat430(one level shallower):
Modified from Wade Fagen-Ulmschneider & Karle Flanagan’s STAT 107 - Fall 2019 guide with permission.