how to set an environment variable in bash - Search
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    To export an environment variable in Bash, you can use the export command. This command sets the variable for the current shell session and any child processes started from it.

    Example

    export MY_VAR="Hello, World!"
    echo $MY_VAR # Output: Hello, World!

    Setting Environment Variables Permanently

    To make an environment variable persistent across sessions, you need to add it to your shell's configuration file.

    For a Single User

    Add the export command to your ~/.bashrc or ~/.bash_profile file:

    echo 'export MY_VAR="Hello, World!"' >> ~/.bashrc
    source ~/.bashrc

    For All Users

    Add the variable to /etc/environment:

    sudo nano /etc/environment
    # Add the line:
    MY_VAR="Hello, World!"

    Important Considerations

    • Temporary vs. Permanent: Using export in a terminal sets the variable only for the current session. To make it permanent, add it to a configuration file.

    • Sourcing Scripts: If you want to set environment variables from a script, you need to source the script using source script.sh or . script.sh.

    • Scope: Variables set in /etc/environment are available system-wide, while those in ~/.bashrc or ~/.bash_profile are user-specific.

    How do I set a shell environment variable?
    For example, to set the SHELL environment variable, you can use the following command: This command sets the SHELL environment variable to /bin/bash. Shell configuration files such as ~/.bashrc and ~/.bash_profile can also be used to set environment variables. The syntax for setting environment variables in a shell configuration file is as follows:
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    How-To Geek
    https://www.howtogeek.com/668503/how-to-set-environment-varia…
    How to Set Environment Variables in Bash on Linux - How-To Geek
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