[ruby-core:103804] [Ruby master Feature#17859] Start IRB when running just `ruby`

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


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

I can understand your intent. But could you tell us more about the context?

In my experience, if I do not understand a command, I tend to run `[command] --help` or `man [command]`, not the `[command]`. Because running `[command]` could be dangerous. I hope a beginner will learn not to run `[command]` without `--help` when they do not know the command.

To perl

```
$ perl
# just hangs
```

I feel it depends on how much the following use case with Ctrl+D is important.

```
$ ruby
p "abc"
Ctrl+D
"abc"
```

Even when ruby will be like python like your suggestion, I expect that the following use case still works.

```
$ ruby <<EOF
> p "abc"
> EOF
"abc"
```


----------------------------------------
Feature #17859: Start IRB when running just `ruby`
https://bugs.ruby-lang.org/issues/17859#change-91919

* 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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