Bangline ./

Here is a question: what is the difference between ./ and sh when executing a shell script?

1. sh test.sh You pass test.sh as a parameter to sh.
2. ./test.sh The system calls out the interpreter program and feeds in the scripts contents. So you will need a bang line(the very first line in the script and starts with #!). The rest part of the script will be passed to the program immediately after.

So you can run shell via #!/bin/bash. You can even run python via #!/usr/bin/python (the rest code is in python)

Here is the reference.