==== What is a ".bashrc" file ====

".bashrc" is a shell script that Bash runs whenever it is started interactively. You can put any command in that file that you could type at the command prompt. You put commands here to set up the shell for use in your particular environment, or to customize things to your preferences.

".bashrc" file is always in your home directory as a hidden file. You can see it by commanding: ''ls -a'' in your home directory. Note that if this file does not exit, you can create it by typing ''touch .bashrc'' in your home directory.