[ruby-core:103818] [Ruby master Feature#17859] Start IRB when running just `ruby`

Issue #17859 has been updated by jaruga (Jun Aruga).


@david okay, thanks for sharing the context.

@duerst I agree that the "friendly" is important for Ruby, according to the [Ruby official website logo "Ruby - A PROGRAMMER'S BEST FRIEND"](https://www.ruby-lang.org/en/).

We can implement the alternative by `ruby -`, or we can continue to use the case STDIN is not TTY as @Eregon said. I can not find any reason not to accept @david's suggestion. So, +1 from me.




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Feature #17859: Start IRB when running just `ruby`
https://bugs.ruby-lang.org/issues/17859#change-91936

* 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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