VIM Editor Guide
VIM is an editor for Linux systems. It is a powerful tool to edit files directly from the command shell. Although VIM is a confusing program for new users, it makes the editing of configuration files a lot easier.
VIM can be useful to edit a configuration file from the command line. Whether it's remotely using ssh, a temporary root session using su -, or a Linux rescue disk; configuration files can be modified directly using VIM.