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- [Instructor] Out of the box, Vim is very powerful,

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but one of Vim's main strengths

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is the amount of customization you can do.

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You can add commands,

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map keys,

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and even write extensions in various languages

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such as Vimscript, Python, and more.

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Depending on your operating system,

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Vim's configuration file

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will be in a different location.

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On Mac and Linux,

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it's .vimrc under your home directory.

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On windows,

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it will be c:/users/<yourlogin>_vimrc.

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If you work on many systems,

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try to avoid too much customization

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in your vimrc file.

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It will make it hard to use vanilla vim

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on other systems you are using.

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Vim users create their vimrc for years.

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Mine is 20 years in the making

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and I'm still tinkering with it.

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Let's try a small example.

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Vim hello.py.

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If you'd like to see line numbers,

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you can set his option with

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:set number and enter.

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:set can be abbreviated to :se

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and number can be abbreviated to nu.

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If you'd like to switch off line numbers,

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add the no before the option.

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Set, no, nu.

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And the line numbers are gone.

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If you'd like this setting to be permanent,

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edit through your vimrc.

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I'm on a Mac so,

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edit home directory .vimrc.

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And now, I to enter insert mode

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and write set number.

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The language of vimrc is called Vimscript.

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In Vimscript, we start comments with double quote.

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Show line numbers,

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and now save and exit.

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Escape for normal mode, :wq enter.

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And now, when we open the file again,

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vim hello.py

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we will see the line numbers.