Issue #15840 has been reported by nobu (Nobuyoshi Nakada).

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Feature #15840: configuration path search
https://bugs.ruby-lang.org/issues/15840

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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Related to #15828, a standard method to search configuration files would be nice.

We (naruse and nobu) talked about it and agreed on `Etc.config_file`

To load a config file as Ruby script:
```ruby
Etc.config_file(basename) {|path| load(path) rescue nil}
```

or just search the file:
```ruby
file = Etc.config_file
```
`basename` will be defaulted to the base name of the program name,`$0`.


A flag to write new file:
```ruby
Etc.config_file(create: true) {|f| FileUtils.mdir_p(File.basename(f)); File.write(f, content)}
```




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