A batch file on a Mac is just like a batch file on a PC... just a text file followed by a series of commands. Except on a Mac, it's generally called a shell script. I'm no expert here, but you'd put the following on the first line:
The Mail application that ships with macOS and OS X is solid, feature-rich and spam-eliminating software that is also an easy-to-use email client. Optimized to work on the Mac, the Mail app is trouble free and full featured. It can handle all your email accounts in one place. Apple Mail is a free client that comes preinstalled on every new Mac sold—that in itself makes it a solid default choice for Mac users. The application's trademark postage stamp icon hasn't changed a lot over the years, and despite steady development from Apple, the client still retains its old-school feel. The Bat is not available for Mac but there are plenty of alternatives that runs on macOS with similar functionality. The most popular Mac alternative is Thunderbird, which is both free and Open Source.If that doesn't suit you, our users have ranked more than 50 alternatives to The Bat and many of them are available for Mac so hopefully you can find a suitable replacement.
#!/bin/bash
Then put the other commands just like in a Windows batch file. Save it as SomeScript.sh and then, from the command line, make it executable:
chmod +x SomeScript.sh
To run it, just enter its path on the command line:
./SomeScript.sh
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Or, if you're currently in another directory:
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/path/to/script/SomeScript.sh
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Again, I'm no expert, but I hope this helps.