From: "nobu (Nobuyoshi Nakada) via ruby-core" <ruby-core@...>
Date: 2026-02-09T09:41:09+00:00
Subject: [ruby-core:124731] [Ruby Misc#21872] `-S` with directory separator

Issue #21872 has been reported by nobu (Nobuyoshi Nakada).

----------------------------------------
Misc #21872: `-S` with directory separator
https://bugs.ruby-lang.org/issues/21872

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
----------------------------------------
Ruby���s `-S` option searches the script from `$RUBYPATH` and `$PATH` always:

```console
$ mkdir -p a/test
$ echo 'p $0' > a/test/t.rb
$ chmod +x a/test/t.rb
$ PATH=$PWD/a:$PATH ruby -S test/t.rb
```

However, I don't think this action is intentional, because Perl���s `-S` doesn't search `$PATH` as stated at https://perldoc.perl.org/perlrun#-S:
> makes Perl use the "PATH" environment variable to search for the program **unless the name of the program contains path separators**.

```console
$ mkdir -p a/test
$ echo 'print $0, "\n"' > a/test/t.pl
$ chmod +x a/test/t.pl
$ PATH=$PWD/a:$PATH perl -S test/t.pl
Can't open perl script "test/t.pl": No such file or directory
```

This is same in `sh`:
```console
$ echo 'echo $0' > a/test/t.sh
$ chmod +x a/test/t.sh
$ PATH=$PWD/a:$PATH sh -c test/t.sh
sh: test/t.sh: No such file or directory
```




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