$ . ~/.bashrc This command will read your .bashrc file and make all of its aliases active. It could affect other settings, but only if any have been changed since your login.

Environment variables hold important data that may be required by certain processes. Here's how you can configure them in Ubuntu.

The ls command assumes that you don’t want to see files that start with dots, and any files that are included in a new home directory, like .bashrc, start with dots.