What is the difference between “./somescript.sh” and “. ./somescript.sh”

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./setup.sh runs the script, a new shell will be started that runs the script. That new shell cannot affect the parent shell that started the script.

. ./setup.sh is a shorthand for source ./setup.sh and it will run the script in the current shell, instead of starting a new shell to run it. This means the script can alter the behavior of the current shell, e.g. set new environment variables.

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