Running .sh scripts in Git Bash

#!/usr/bin/env sh

this is how git bash knows a file is executable. chmod a+x does nothing in gitbash. (Note: any "she-bang" will work, e.g. #!/bin/bash, etc.)

Let's say you have a script script.sh. To run it (using Git Bash), you do the following: [a] Add a "sh-bang" line on the first line (e.g. #!/bin/bash) and then [b]:

# Use ./ (or any valid dir spec):
./script.sh

Note: chmod +x does nothing to a script's executability on Git Bash. It won't hurt to run it, but it won't accomplish anything either.