From: "nobu (Nobuyoshi Nakada) via ruby-core" <ruby-core@...>
Date: 2025-01-08T12:35:15+00:00
Subject: [ruby-core:120556] [Ruby master Bug#21018] Show invalid command line option more properly

Issue #21018 has been reported by nobu (Nobuyoshi Nakada).

----------------------------------------
Bug #21018: Show invalid command line option more properly
https://bugs.ruby-lang.org/issues/21018

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Currently the invalid command line option character is printed as-is.

This makes the error message confusing sometimes.

```console
$ ruby -$'\rx'
  (-h will show valid options) (RuntimeError)

$ ruby -$'\U1f608'
ruby: invalid option -?  (-h will show valid options) (RuntimeError)
```

These are actually:

```console
$ ruby -$'\rx' |& cat -e
ruby: invalid option -^M  (-h will show valid options) (RuntimeError)$

$ ruby -$'\U1f608' |& cat -e
ruby: invalid option -M-p  (-h will show valid options) (RuntimeError)$
```

I think control characters and multibyte characters should be printed properly.



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