What is the bash equivalent to Python’s `if __name__ == ‘__main__’`?

Solution:

if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
    main "$@"
fi

I added this answer because I wanted an answer that was written in a style to mimic Python’s if __name__ == '__main__' but in Bash.

Regarding the usage of BASH_SOURCE vs $_. I use BASH_SOURCE because it appears to be more robust than $_ (link1, link2).

Here is an example that I tested/verified with two Bash scripts.

script1.sh with xyz() function:

#!/bin/bash

xyz() {
    echo "Entering script1's xyz()"
}

main() {
    xyz
    echo "Entering script1's main()"
}

if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
    main "$@"
fi

script2.sh that tries to call function xyz():

#!/bin/bash

source script1.sh

xyz