Run a shell script using the current shell instead of creating another one

dot_to_run_sh_file

1- To run an sh script file using current shell,
2- where other sh scripts may have been sourced,
3- Add a dot and space before running it:
$ . <file_to_run.sh>
4- To run it creating a new shell use dot slash:
$ ./<file_to_run.sh>