how to set vi line number?

[Paul Procacci]

EdwardKing wrote:
> my first question is whether vi can show line number,such as 1: 2: 3:?
> my second question is whether vi support c syntax,such as show "#include" with other different color?
>
> How to modify to realize above function?
> thanks
>
>
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You may want to start with installing vim. vi to my knowledge is not
`color capable`.