Because when you run a script, the parent shell (the one you run your commands from) starts a non-interactive shell to run your script which has interactive flag disabled i and only turns on two options

• -h to locate and remember (hash) commands as they are looked up for execution.
• -B to allow the shell to perform brace expansion

You can see the complete list of set options which will be seen in the output of $- - The Set Builtin

Because when you run a script, the parent shell (the one you run your commands from) starts a non-interactive shell to run your script which has interactive flag disabled i and only turns on two options

• -h to locate and remember (hash) commands as they are looked up for execution.
• -B to allow the shell to perform brace expansion

You can see the complete list of set options which will be seen in the output of $- - The Set Builtin

Other options available in the interactive shell, -i to indicate to run the shell in interactive mode

• -m to allow Job control
• -H to enable ! style history substitution