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You can modify the bashrc file. This method is safer. It can control the permissions to use these environment variables to the user level. This is for a specific user. If you need To give a user permission to use these environment variables, you only need to modify the .bashrc file in his or her personal user home directory.
Specific method:
vim ~/.bashrc
Add below:
Export PATH="$PATH:/NEW_PATH"
Recommended tutorial: linux tutorial
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