In order to auto-execute a command or a script every time you open a Mac Terminal, follow the below steps,
- Open Terminal App,
- Go to Menu: Terminal -> Preferences... (Settings on macOS Ventura or later)
- Go to Profile tab,
- Now go to the shell tab,
- Check "run command" under Startup and type the command or script that you want to execute.

Running a curl command to get the weather details every time you start a new terminal instance.

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