[ruby-core:103833] [Ruby master Feature#17859] Start IRB when running just `ruby`

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


> I would not take any objection to this suggestion if IRB initialization were x10 faster.

@xtkoba Could you tell us why you have the concern or mind about the speed of the IRB in case that it is called by `$ ruby`? Are you considering a case that the IRB is unintentionally or wrongly called in `$ ruby` by users? Related to #17684, it might be a good idea to use the `irb` light weight version with `--disable-gems` or an equivalent thing to load a few things in `$ ruby` to solve your concern.





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Feature #17859: Start IRB when running just `ruby`
https://bugs.ruby-lang.org/issues/17859#change-91951

* 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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