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I would use bsd or solaris derivative operating system with ZFS such as freenas or likes.

As for network part, exposing stuff to internet comes with inherent risk.
You can minimize it by patching...

With a question like this it ALWAYS helps to know what operating system and shell you're using...

Assuming you're using a shell that provides the basic parameter expansions required by the POSIX...

First things first: how mail works

There are "mail servers" (correctly named: mail transfer agents), which act like a postman: either they know the user to whom to deliver the mail themselves...

The main difference between a .doc and a .txt is formatting like bold face typing, colours, tables, hyphenation, what have you, and/or embedded pictures etc.. All of this is missing in a plain .txt....

Try:
xfce4-terminal -e "nano example.txt"

If you're on a system with multiple terminal-applications, multiple users with their own preferences, and if TUI is installed, you could also try:
...

My above was just an example! Put your case ... esac in the place of the echo $x (which was a placeholder!).

select will take ANY list and turn it into a menu:PS3="Enter Value X: "
select X in A B C D E F; do echo $X; done
1) A
2) B
3) C
4) D
5) E
6) F
Enter Value X:
Then, add a case ... esac...

I repeat: " Unless #!interpreter_path starts in column 1 on the 1st line in your file, that line is just a comment and has absolutely no effect on what interpreter will be used to run your script." ...

Whatever shell is running your script via the "run in terminal" command is a shell that doesn't know about the recent bash and ksh [[ expression ]] test syntax.

If you convert all occurrences of...