If you are a vim editor fan and a C programmer, you could get frustrated by typing commands for line number, C indentation and syntax. To automate this, install vim-runtime package. This includes rules for language-specific syntax highlighting and indentation, color schemes etc.
Create a file .exrc in home directory. $vim ~/.exrc
Add these lines to the file
set nu ” for line number
set cindent ” for C indentation i.e. correct spacing for better understanding
syntax on ” for coloring according C syntax
A lot more options could be added for user related customizations.