[ruby-core:103811] [Ruby master Feature#17859] Start IRB when running just `ruby`

Issue #17859 has been updated by duerst (Martin Dst).


I agree it's convenient, would be really great to have it. I was thinking about proposing it, too.

@jaruga: People definitely shouldn't run unknown commands, but Ruby isn't an unknown command, it's a friendly programming language :-). And adding this will make Ruby more friendly. Usually, Python is more obnoxious ("Use exit() or Ctrl-D (i.e. EOF) to exit" when typing "exit" being the most famous example), and we should make sure we keep it that way.

@chrisseaton: A message like this would be a good idea, but it could be made a lot shorter, e.g. "Starting IRB; use 'ruby -' to read from standard input".

@jeremyevans0: My guess is you are in a (quite small) minority. It takes a very steady hand to input code that way (or copy-paste). Pasting code into irb may also work, as will using "ruby -", which is just two more keystrokes away.

----------------------------------------
Feature #17859: Start IRB when running just `ruby`
https://bugs.ruby-lang.org/issues/17859#change-91926

* 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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