How to get arguments with flags in Bash

Question

I know that I can easily get positioned parameters like this in bash:

$0 or $1

I want to be able to use flag options like this to s

Answer 1

#!/bin/bash

if getopts "n:" arg; then
  echo "Welcome $OPTARG"
fi

Save it as sample.sh and try running

sh sample.sh -n John

in your terminal.