However, launching programs via CLI sometimes also brings forth some problems. One such is the command not found error that the shell throws at you when you try to execute certain programs/commands. Although you can temporarily overcome this by prepending your command with the program’s absolute path, this isn’t a very practical approach if you want to use that program several times. An alternative (read efficient) solution around the problem is to set the PATH variable for this program. Follow along as we describe the PATH variable and list down the steps on how to set the PATH variable in macOS.
What is the PATH Environment Variable?
PATH or PATH variable is a type of environment variable on all Unix- and- Unix-like operating systems. Environment variables constitute name-value pairs for various programs or processes on an operating system, such as the path, locations of system programs or processes, and other essential information required by other system programs. Talking about PATH, the variable contains a list of all the directories (for various programs added to the PATH) that the shell needs to search for to execute your requested programs through a terminal command.
Why Do You Need to Set the PATH Environment Variable?
On macOS, when you run a command in the terminal, it searches for the path of the requested program in that command inside the PATH environment variable. If a path address is found, it executes the command successfully and returns the output. If not, you get the command not found error. Like we mentioned initially, specifying the absolute or full path of the directory where the program is installed/stored in your command is one way to overcome this error. But unfortunately, since doing so over and over would take up a lot of your time and effort, this isn’t a very efficient approach and can’t be used when you want to run commands repeatedly. On the other hand, if you set the path for that program in the PATH variable, you can easily use it in any directory on your system without specifying its absolute path. Basically, what this means is that instead of running your command like this: /path/to/program/script.sh you can simply use: script.sh inside any directory on the file system.
How to Set the PATH Variable in macOS
Setting the PATH variable in macOS requires using the CLI—unlike Windows, which lets you do so using both GUI and CLI. Plus, depending on your requirements, there are two ways to set the PATH on your Mac: temporary and permanent. When you set PATH temporarily, your path changes apply only to the current session—logging out of the session reverts back the PATH to its previous state. In contrast, setting the PATH permanently will preserve your changes permanently and apply them to all your sessions—even after you start a new terminal session or restart your Mac. With that out of the way, follow the steps in the sections below to set PATH on your Mac.
Identifying the Current PATH Entries
Before you add a program’s path to the PATH variable on your Mac, you should first identify the current entries in your system’s PATH to verify that there isn’t already an entry for the same. To view the current PATH settings, open the Terminal app and run: echo $PATH
If you’re setting PATH for a new program/script, you can skip this step.
Setting the PATH Variable Temporarily
Once you’ve identified the current PATH entries, you can now set the PATH for any program. If you want to use/execute a program via terminal only in your current session, you can set its path temporarily using the following command: export PATH=$PATH:absolute/path/to/program/ For example, if you want to set PATH for Python 3.6, you’d run: export PATH=$PATH:/Library/Frameworks/Python.framework/Versions/3.6/bin Doing so will set a temporary variable for the program, which you can use in your commands in the current terminal session or the active terminal window.
Setting the PATH Variable Permanently
In case you want to use a program regularly, you must set its path permanently. To do this, you need to access the shell’s configuration or profile file and add the program’s path to it. Depending on the macOS version you’re running on your Mac, this can be done via either the bash shell or zsh (z shell).
For older macOS versions (before Catalina): bash (.bashrc or .bash_profile) For macOS Catalina and later: zsh (.zshrc or .zsh_profile)
Now that you know the file where you need to add the path for your program/script, open the terminal and enter a command based on your shell: For bash nano ~/.bash_profile or nano ~/.bashrc For zsh: nano ~/.zsh_profile or nano ~/.zshrc If the config file or profile file is missing from your system, this command will create a new one; in case it exists, it’ll open the same, and you can then edit it. Now, all you have to do is find the full path for the program or script on the file system. For this, open the Finder and navigate to the directory where the program or script is stored or installed. Here, right-click on the program/script, press the Option key, and select Copy xyz as Pathname, where xyz is a program name. Go back to the terminal and open the appropriate config file or profile for your shell in nano or any other text editor. Inside the file, enter the following line: export PATH=$PATH:/path/to/directory …where you need to replace path/to/directory with the exact path you copied in the previous step. Or, if the file already contains path entries, append the line with a colon (:) followed by: /path/to/directory Hit Control + O to write your changes to the file. When prompted to confirm the file name, hit Return to proceed with the default. Press Control + X to exit the editor. Now, verify if the path has been added by opening a terminal window and running: echo $PATH Finally, close the terminal window and reopen it to start a new session. Alternatively, you can run the following command to apply the changes immediately: source ~/.bashrc or source ~/.bash_profile or source ~/.zshrc or source ~/.zsh_profile Once that’s done, you should be able to run your program or script from any directory in the file system.
Add to PATH Mac: Accessing Programs From Anywhere via Terminal
With the PATH environment variable set to use the path of the program you want to use, you can now execute/access it from anywhere in the file system via the terminal. If you use Python or shell scripts to automate your workflow, setting the PATH for these scripts can simplify your life as you can now access them inside any directory without needing to specify their absolute paths.
1. How do I set an environment variable in Catalina Mac?
If you’re running macOS Catalina (or above), setting the environment variable is as simple as modifying the shell config or profile file to incorporate the path of the program/script you want to access anywhere. Since macOS uses zsh as the default shell on Catalina (and above) versions, you just need to edit either the .zshrc or .zsh_profile file and add the path of your program or script. Follow the steps earlier in the post to know the steps and the different ways to do this.
2. How do I permanently set PATH on Mac?
Setting the PATH on Mac permanently means your PATH environment variable changes aren’t limited to your current shell session, unlike the temporary variable settings. So your system’s shell can continue to access it even when you start a new session or restart your Mac. To permanently set PATH on Mac, all you have to do is open either bash files (.zshrc or .zsh_profile) or zsh files (.zshrc or .zsh_profile) and add your program or script’s PATH to it. Steps for doing which are listed in the guide above.
3. How do I find the PATH variable on a Mac?
To find the PATH variable on Mac, open a terminal window and run echo $PATH. After which, the shell will return a list of all the directories currently listed under the PATH environment variable on your Mac.
