From LedHed's Wiki
Overview
Sometimes you need to make a change to your ~/.bashrc file (like uncomment 'll' on Debian systems SO ANNOYING!) but don't want to logout/ login for the changes to take effect. Here is a quick way to reload you bashrc (Bash RunComm) file.
Reload
source ~/.bashrc
or
. ~/.bashrc
^^ Shortcut
Reference
https://stackoverflow.com/questions/2518127/how-do-i-reload-bashrc-without-logging-out-and-back-in