Command not found problem on Mac M1

I use Mac Pro M1 to develop Android and iOS app.

I encounter "Command not found" error when executing command on terminal. 

So, I go through this problem.

1. Why "command not found" occur?

This occurs because environmental variable does not exist.

2. How to solve

- Start terminal

- Open zshrc file

ex) vi ~/.zshrc

- Insert environmental path

ex) export PATH = example/program/path

- Apply zshrc file executing underneath code.

ex) source ~/.zshrc

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