Get Script Path in Shell

#!/usr/bin/bash

dir_old=$ (PWD)
absolute_script_path=$ (CD $ (dirname $) && pwd)
relative_script_path=$ (dirname)
Wrong_absolute_script_path= $dir _old/$relative _script_path

echo "Current PATH: $dir _old"
echo "Absolute_script_path is: $absolute _script_path"
echo "Relative_script_path is: $relative _script_path"
echo "This path might is wrong: $wrong _absolute_script_path"

# Fail If use absolute path to invoke script
CD $wrong _absolute_script_path && pwd

Get Script Path in Shell