Terminal For Mac

Using screen as a serial terminal on Mac OS X. Tech Talk 0 Comments. If you develop on an Apple and find yourself doing any sort of device or embedded development, you will quickly find the need for a serial terminal on Mac. There are a few software apps out there, but I find it much simpler to simply use the terminal application. One of the coolest ways to get familiar with the Terminal is to use it to open files.

Using screen as a serial terminal on Mac OS X

Geek Inc.

If you develop on an Apple and find yourself doing any sort of device or embedded development, you will quickly find the need for a serial terminal on Mac. There are a few software apps out there, but I find it much simpler to simply use the terminal application “screen”.
This works well particularly if you have an RS-232 serial to USB converter.
The first thing to do is determine which device you want to connect to.

Once you’ve determined which device you would like to use, you can execute the SCREEN command to start the serial terminal session on your Mac. Remember to specify the speed (baud rate) after the device name.

Once you’ve connected, you can use the terminal as you normally would.
To exit (and close the screen gracefully) press:

Screen will then prompt you to quit and kill all of your windows. Press “y” and you’ll be back to your shell terminal.
This method works equally well if you want to connect to a serial bluetooth device. You must simply make sure that the bluetooth device is paired and active. Then you will be able to see the device in the list of devices. Once you’ve connected to the serial bluetooth device with screen, the connection will be held active for the length of your session.
I’ve used this method to connect to the sparkfun Bluetooth Mate Gold. It simply appears as a serial stream that you can communicate with exactly as you would with any other serial device.

If you work on Macs for a reasonably long time, eventually you will encounter problems which require the Terminal app. In its core, macOS is a UNIX system, and some troubleshooting requires doing things that are not available from GUI (graphical user interface).

I know that for non-technical folks Terminal sounds too intimidating. Do not fear, though, coz I’ll teach you how to use Terminal as a pro in less than 10 minutes.

There are multiple ways to open Terminal on Mac, and the best approach is to open it with Spotlight Search. Press Command (⌘) key and hit the Space bar. In the Spotlight Search bar type “terminal” and hit Enter. This will open Terminal in the current user directory.

I know that a smart reader like you would count the keystrokes and say: “Hey, Al, I have to hit the keyboard 11 times. You promised 4. What happened?”

Terminal For Mac

Well, first, if you hit Command and Space bar, and then type just “t” it is possible that autocomplete function in Spotlight will display Terminal and all you need to hit Enter to start the app. And second, we’re not there yet. We still have some hacks to learn.

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I promised, and I will deliver. But now, let’s answer the question that many people ask.

How to open Terminal in the current directory?

Let’s assume you were working with the Finder. Finder is the built-in app which allows users to browse disks and folders on Mac. If you not familiar with the Finder or need a refresher read my post about it:

For instance, I created three folders in my Desktop: TestFolder1, TestFolder2, and ScreenShots. And I want to open the Terminal in TestFolder1 directory.

The first approach is to open a Terminal, type cd, and hit Space. Then drag the folder to the Terminal window. This will paste the full path of the folder in the Terminal app. Now if you hit Enter, the current directory will change to TestFolder1.

This technique is also useful when you need to work with the file. For instance, if I had a text file TestFile.txt on the Desktop and I want to open it with built-in nano editor all I need to do is type “nano” and then drag the file to the Terminal window.

However, there is a better way to open the current directory.

  • Select the folder you want to open in the Finder.
  • Click on Finder menu and scroll to Services item.
  • When Services item expands click on New Terminal at Folder.

And this, my dear reader, is how you open the Terminal on Mac in 3 clicks: tap on the folder, click on Finder menu and tap on New Terminal item.

But, what if you don’t see New Terminal option in Services menu? There are two possible reasons for this.

Reason 1. The options were not configured yet. To enable both “New Terminal at Folder” and “New Terminal tab at Folder” go to Finder menu, scroll to Services, and then scroll all the way to the bottom and tap on “Services Preferences.”

Make sure the Shortcuts tab is selected at the top of the pop-up window and click on Services item in the left pane. Scroll and find both options under Files and Folders section in the right pane. Make sure that both options are checked.

How to set a shortcut to open Terminal on Mac

After enabling both “New Terminal at Folder” and “New Terminal tab at Folder” options in the Service Preferences add command shortcuts. By default, the shortcut is none.


Click on “New Terminal at Folder” option and the label will change to Add Shortcut. Tap on Add Shortcut label.

With your left hand press Control, Option (Alt) and Command buttons and hold. Then with the right hand, tap on T key and release all keys.

Now, select any folder in the Finder and use newly created Control+Option+Command+T key combination. This is how you will open a Terminal app in the selected directory in 4 keystrokes!

Here’s the second reason why the New Terminal option is not available in Services (and the key combination isn’t working) – Finder does not allow Services on items in the Sidebar (left pane). So, if you want to open Terminal app in Desktop folder from the Finder’s sidebar, it will not work.

But I happened to know a workaround for this issue. Right-click on the sidebar item, e.g., Downloads or Desktop, and in the context menu select “Show in Enclosing Folder.” Using this feature will reveal the folder in the right pane of the Finder.

Now, you can use Control+Option+Command+T key combination (or Finder->Services menu) to open the Terminal.

How to open Finder from Terminal

But how about the opposite? What if I’ve been switching directories in the Terminal and now I want to reveal my current directory in the Finder app?

It’s super easy. Use open command followed by the directory name. There is a shortcut for the current directory in macOS – a dot symbol. So, to open the current directory in the Finder type “open .“, like this:

Basic navigation commands in Terminal

Since you are planning to use the command line, you need to know some basic commands. There are many commands, but all you need is only three.


The first command is PWD, which stands for Print Working Directory. If you type it, the command will print the full path of the current folder, so you will never get lost. By the way, all commands are case-insensitive. It means it doesn’t matter if you type pwd or PWD; the result will be the same.


This command will list the current directory contents. So, if you want to know which files and directories locate under the current folder, use this command.


Next command is CD which stands for Change Directory. Before using this command, you have to know the difference between the relative and absolute paths. If the path of the folder in the command starts with slash ‘/’ then it’s an absolute path, i.e., it starts from the root.

Otherwise, the path is relative, i.e., relative to the current folder.


cd Desktop will change the current directory to the Desktop folder located in the current directory. If the current directory does not contain Desktop, the result would be an error “No such file or directory.”

cd /Library will change the current directory to Library folder under root (in macOS startup disk level).

There are three handy shortcuts for folder names.

One we already know – ‘.’ is for the current directory. Another one is ‘..’ – two dots. It’s a parent folder. So, if you want to go up in directory tree hierarchy type:

Terminal For Macbook

cd ..

Don’t forget the space between cd and dots.

The third shortcut is ‘~’ – tilde, which is used for the home directory. In macOS, it’s /Users/user_name folder (your user folder). So, if you need to go back to home folder type:

cd ~

Using auto-complete in Terminal

Since now you are almost a command line expert, it’s time for a neat productivity hack.

Let’s enable the autocomplete feature:

  • Open the Terminal app
  • Type nano ~/.inputrc
  • Paste the following on separate lines

set completion-ignore-case on
set show-all-if-ambiguous on
TAB: menu-complete

  • Hit Control+O to save changes to the file
  • Hit Control+X to exit nano
  • Hit Command+Q to close the program

Open a new Terminal window and type:
Hit the Space bar

Now, if you hit the Tab key, the Terminal will show the directory or file name located in the current folder. You can also type the first few characters and hit Tab for auto-complete. Every time you hit Tab, the app will rotate and display the next possible directory or file.

This feature is super useful to increase speed when working with directories and reduce spelling mistakes.

Terminal customization

I don’t know about you, but I don’t like the default app theme: black text on a white background. Fortunately, it is easy to change the look and feel of the program.

  • Start Terminal
  • Goto Terminal menu and click on Preferences
  • Click on the Profile tab and select the one you like. I like Pro.
  • Click on Default button.
  • Close the Preferences window.
  • Close the Terminal.
  • Start Terminal again with the new profile.

Terminal For Macbook Air

Other ways to open Terminal

As I mentioned earlier, there are multiple ways to open the Terminal. I already described the best ways to do it, but here I want to go over the other options quickly.

Open from Dock

When Terminal is open its icon will appear in the Dock (a bar with all icons usually at the bottom of the screen). Right-click on the app’s icon and in the context menu, click on “Keep in the Dock” option.

From now on, you can open Terminal with one click on the icon.

Open from Finder

  • Start Finder
  • Click on Applications folder in the Sidebar
  • Scroll to Terminal app under the Utilities folder
  • Double click on Terminal .app

Now, you know where Terminal is on Mac: in ApplicationsUtilities folder.

Open on Start

If you want the Terminal app to start as soon as you log in, there is a solution for that too.

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  • Open System Preferences
  • Tap on Users & Groups pane
  • Click on the Login Items tab
  • Click on the plus icon
  • In the open file, dialog locate the app the same way we did in the previous paragraph

Next time, you log in or restart MacBook the Terminal app will start automatically.

Another way opening from Finder

  • Start the Finder app
  • Click on Go menu
  • Scroll to and click on Utilities item
  • Find the Terminal in the folder and start it

Terminal For Macbook

From Launchpad

Macs have a special place to launch their apps: Launchpad (an icon with rocket picture).

  • Click on Launchpad
  • Click on Other pane
  • Click on Terminal


That’s all you need to know to become an expert in Terminal.

In the end, I want you to have some fun and watch a Star War movie. Start the Terminal and paste the following:

telnet towel.blinkenlights.nl