How do I edit $PATH (.bash_profile) on OSX?
You have to open that file with a text editor and then save it.
touch ~/.bash_profile; open ~/.bash_profile
It will open the file with TextEdit, paste your things and then save it. If you open it again you'll find your edits.
You can use other editors:
nano ~/.bash_profile
mate ~/.bash_profile
vim ~/.bash_profile
But if you don't know how to use them, it's easier to use the open approach.
Alternatively, you can rely on pbpaste. Copy
export ANDROID_HOME=/<installation location>/android-sdk-macosx
export PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools
in the system clipboard and then in a shell run
pbpaste > ~/.bash_profile
Or alternatively you can also use cat
cat > ~/.bash_profile
(now cat waits for input: paste the two export definitions and then hit ctrl-D).
A bit more detailed for beginners:
Before you begin with .bash_profile on Mac, please be aware that since macOS Catalina zsh (z shell) is the default shell. Therefore stuff we used to put in the .bash_profile now belongs to the .zshenv or the .zshrc file.
.zshenv .zshrc ? (Found here)
.zshenv: invocations of the shell. Often contains exported variables that should be available to other programs. For example, $PATH.
.zshrc: Sourced in interactive shells only. It should contain commands to set up aliases, functions, options, key bindings, etc.
STEP 1
Make sure the .bash_profile file is existing? (or the .zshenv of course) Remember that the .bash_profile file isn't there by default. You have to create it on your own.
Go into your user folder in finder. The .bash_profile file should be findable there. -> HD/Users/[USERNAME]
Remember: Files with a point at the beginning '.' are hidden by default.
To show hidden files in Mac OS Finder:
Press: Command + Shift + .
If it's not existing, you have to create .bash_profile on your own.
Open terminal app and switch into user folder with simple command:
cd
If it's not existing, use this command to create the file:
touch .bash_profile
STEP 2
If you can't memorise the nerdy commands for save and close in vim, nano etc (the way recommended above) the easiest way to edit is to open .bash_profile (or the .zshenv) file in your favored code editor (Sublime, Visual Studio Code, etc.).
Finder -> User folder. Right click -> open with : Visual Studio Code (or other code editor). Or drag it on app in dock.
… and there you can edit it, pass export commands in new lines.
If you are using MAC Catalina you need to update the .zshrc file instead of .bash_profile or .profile