Execute a bash script in the current shell

dot-space.sh

#!/bin/bash

echo 'alias ppwwdd="pwd"' >> ~/.bashrc

source ~/.bashrc

ppwwdd

# Execute Shell Script Using . ./ (dot space dot slash)
# Executing a shell script using “dot space dot slash”
# will execute the script in the current shell without forking a sub-shell.
# . ./ executes the commands specified by the script in the current shell,
# and can be used to prepare the working environment.

# If this script is run ./dot-space.sh
# an error `ppwwdd: command not found` will output to the console

# If this script is run . ./dot-space.sh
# the working directory will be printed to the console