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From: Simon Krahnke <overlord@gmx.li>
Newsgroups: comp.lang.ruby
Subject: Re: strange behavior on windows: ruby.exe: illegal switch in RUBYOPT: -V (RuntimeError)
Date: Fri, 09 Aug 2013 01:42:08 +0200
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* Alon Nisser <alonisser@gmail.com> (2013-07-27) schrieb:

>I'm using ruby on windows (installed from ruby installer). most of the time ruby based apps such as vagrant, rspec, puppet etc work fine
>
>but once in a while they all start to crash with this error:
>
>   ruby.exe: illegal switch in RUBYOPT: -V (RuntimeError)
>
>when I start a new command console - everything there works fine (for a while). this is getting really annoying. and I can't get answers on google (all of my search results show -F and not -V like this error
>
>this is the ruby version:
>
>  ruby 1.8.7 (2013-06-27 patchlevel 374) [i386-mingw32]
>
>installed in :
>
>C:\Ruby187>
>
>win version: win 7 enterprise sp1 64 bit

You should look into the environment variable "RUBYOPT".

mfg,                       simon .... l