Issue #12194 has been reported by Nobuyoshi Nakada.

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Feature #12194: File.dirname optonal parameter
https://bugs.ruby-lang.org/issues/12194

* Author: Nobuyoshi Nakada
* Status: Open
* Priority: Normal
* Assignee: 
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As talked at the last developers' meeting, I propose an addition of an optional parameter to `File.dirname`.

Often I see the code, like

```ruby
File.dirname(File.dirname(path)) # or
File.expand_path("../..", path)
```
which are not concise.

This proposal can make them as:

```ruby
File.dirname(path, 2)
```

https://github.com/ruby/ruby/compare/trunk...nobu:feature/dirname-level?expand=1



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