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Command Line: Six Basic Command You Should Know


According to the article "Getting to Know Command Line", the command line is the ultimate seat of power on your computer. It is simply a place where you type commands to the computer.

Once we know the important commands, we can create files and run files and delete files so much faster than if we are using the mouse.

How can we use the command line to interact with those directories and files?

 Firstly, we need to have a workspace. The course recommends us to use Goormide, which is an integrated development environment on the cloud. And it is developed by a Korean company. You can feel free to sign up and create your first cloud by following their introduction.

Once you sign in the cloud, you can create your directory and files.

The course introduces six useful Command to interact with directories and files.

List/Change Directories

Command LS

 LS stands for list, and it just shows us all the files and folders of the current folder.

For example, in the terminal, the first line shows my current folder which is "backend". Then, I type "ls" next to that and hit "enter", it will shows "intro to command line" folder which is inside the backend folder.



Command CD

The command CD allows us to change directories.

For example, I type the "cd IntroToCommandLine", it returns us "workspace/backend/IntroToCommandLine". Then, I type "ls" next to that, I can see it list the "message.txt" file.


If I add another file "hello.html" under "IntroToCommandLine" folder, and then type ls next to "backend/IntroToCommandLine" again, it will show two files.


Add New Files/Directories

Command Touch

Touch allows us to make a new file.

For example, if I want to create a new file "color.txt" under "IntroToCommandLine". I can just type "touch color.txt" next to the prompt and hit "enter", it will automatically create that file on the left menu bar.



Command Mkdir

If you want to create a whole directory, you can use command mkdir, which stands for make directory.

I want to add a new folder "Study" under "IntroToCommandLine", so I just type "mkdir Study" next to the prompt. It will add the "Study" folder on the menu.


I can use the same way to add a new file inside the "Study". First, I change the directory to "Study" by using CD command, then use the touch command to make a new file "classone.html" inside the "Study" folder.


Remove Files/Directories

Command RM

We use RM to delete a specific file.

For example, in order to delete the "classone.html", I need to type "rm classone.html" next to "IntroToCommandLine/Study".



Command RM -RF

 If we want to remove the entire directory or folder, we can use "rm -rf". RF stands for the recursive force which basically means that when we say delete a folder, it will delete that.

In order to remove the whole "Study" folder, I will type "rm -rf Study" next to "IntroToCommandLine".


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