[Mac OS] How to Add to the Shell Path in macOS Catalina 10.5 using Terminal


osx-modify-shell-path
The shell path for a user in macOS is a set of paths in the filing system whereby the user has permissions to use certain applications, commands, and programs without the need to specify the full path to that command or program in the Terminal.
So instead of running something like this, with a path to the command:
/usr/local/mysql/bin/mysql
You can just type the command, regardless of where you are in the filing system:
mysql
Your shell path is a bunch of absolute paths of the filing system separated by colons :
You can find out what's in your path by launching Terminal in Applications/Utilities and entering:
echo $PATH
And the result should be like this…
/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
So this is stating that you can run Unix style applications or commands located in 5 default locations of a certain path in the filing system:
  • /usr/local/bin
  • /usr/bin
  • /bin
  • /usr/sbin
  • /sbin
These directories are not visible by default in the filing system but you can make them visible.

Adding a Temporary Location

You can add extra locations to your path, in the mysql example above it’s location /usr/local/mysql/bin which is not in the default path, you can add it in Terminal like so:
PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/mysql/bin
So here I have copied my existing path and added the new location on the end, colon separate the paths. Test it by running echo $PATH again in the Terminal.
One of the disadvantages of this is that the new location will only be honored for that particular Terminal session when a new Terminal window is launched it will have the original default path again.

 Adding in a Permanent Location

To make the new path stick permanently you need to create a .zsh file in your home directory and set the path there. This file controls various Terminal environment preferences including the path.
In macOS Catalina the default shell is Zsh (previously it was the Bash Shell).
cd
Move into home directory
nano .zsh
Create the .zsh file with a command-line editor called nano
export PATH=/usr/local/mysql/bin:$PATH
Add in the above line which declares the new location /usr/local/mysql/bin as well as the original path declared as $PATH.
osx- shell path-modify
Save the file in nano by clicking ‘control’ +’o’ and confirming the name of the file is .zsh by hitting return. And the ‘control’+’x’ to exit nano – also for zsh shell remove any surrounding quotes.

So now when the Terminal is relaunched or a new window made and you check the path by
echo $PATH
You will get the new path at the front followed by the default path locations, all the time
/usr/local/mysql/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin

Rearranging the default $PATH

If you needed to rearrange the paths in the default $PATH variable, you can just do that and leave off $PATH.
So let's say you want /use/local/bin at the beginning to take precedence you can add the default path like so inside .zsh
export PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
And then you can slot in other paths as required.

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