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From: August Werner <august-werner@invalid.invalid>
Newsgroups: comp.lang.ruby
Subject: Re: ruby -e and global variables
Date: 24 Sep 2021 19:09:07 GMT
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tcb...@gmail.com wrote:

> I'm trying to assign a global variable when using ruby -e
> `ruby -e "$a=3"`
> -e:1: syntax error, unexpected '='
> 
> So it seems I can't assign global variables when using ruby -e
> What I wanted is to assign $stdout = StringIO.new
> so I capture the output

Hello,

Your problem with

ruby -e "$a=3"

and therefore also with

ruby -e "$stdout = StringIO.new".

Regardless of whether this makes sense, you have a problem with the shell
(or perhaps other command line interpreter). You are using an unprotected
ruby command text with characters that the shell interprets for itself.

With:

ruby -e '$a=3'

or

ruby -e "\$a=3"

no one complains anymore.