How to access global variables in shell script?

Question

linux

#!/bin/bash
 
cd ../
rm -R --force dist/
npm install
cordova platform rm android
cordova platform add android
cordova prepare
cordova clean
cordova build android
$ANDROID_HOME/tools/bin/sdkmanager --licenses

Answer 1

It's called Environment Variables.
It is important how and where you set them. You can view the list of environment variables in the current sh process by executing the command
env
. Environment variables are usually passed to programs and scripts that you run.
If you want to set a variable so that it is passed when the program starts, it must be exported

ANDROID_HOME=/home/user/android
export ANDROID_HOME

these lines can be executed in the terminal and then the variable will exist in this terminal until it is closed. Or you can paste these lines into ~/.bashrc so that they are executed every time the terminal is started.
Or, if you need to pass a variable to the script once, you can specify it at startup, like this
ANDROID_HOME=/home/user/android ./script.sh
. If the script is launched not in the terminal, but, for example, through an IDE or in a CI / CD system, then you need to read the documentation for it, it is most likely described there as set environment variables.