[ruby-core:103802] [Ruby master Feature#17859] Start IRB when running just `ruby`

Issue #17859 has been updated by jeremyevans0 (Jeremy Evans).


I'm against this.  I often run `ruby`, and input code on standard input to get results, without wanting to use irb. I was literally doing this minutes ago with @ko1 to debug an issue.

----------------------------------------
Feature #17859: Start IRB when running just `ruby`
https://bugs.ruby-lang.org/issues/17859#change-91917

* Author: deivid (David Rodr刕uez)
* Status: Open
* Priority: Normal
----------------------------------------
Compare python:

```
$ python
Python 3.8.3 (default, Jul  8 2020, 16:49:12) 
[GCC 7.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 
```

To ruby:

```
$ ruby
# just hangs
```

I think firing up a console it's a good default behaviour for beginners.



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