# How to check if gems is installed **URL:** \ **Category:** Rails\ **Created:** [December 21, 2007, 10:34pm UTC](https://www.ruby-forum.com/t/how-to-check-if-gems-is-installed/123908 "2007-12-21T22:34:14Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![alex-osu3](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/13edae/32.png) [@alex-osu3](https://www.ruby-forum.com/u/alex-osu3)\ **Post date:** [December 21, 2007, 10:34pm UTC](https://www.ruby-forum.com/t/how-to-check-if-gems-is-installed/123908/1 "2007-12-21T22:34:14Z")
Hi all, I use one-click installer to install ruby, together with gems under my vista box. I can type “ruby -v” from any directory and the promt windows shows ruby 1.8.6 after setting the enviroment variables. But I can only check “gems --version” in this directory c:\ruby\bin. Is it possible to check “gems --version” from other directories? and how? thank you very much, Li ---
**Author:** ![alex-osu3](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/13edae/32.png) [@alex-osu3](https://www.ruby-forum.com/u/alex-osu3)\ **Post date:** [December 22, 2007, 10:25am UTC](https://www.ruby-forum.com/t/how-to-check-if-gems-is-installed/123908/2 "2007-12-22T10:25:22Z")
Try gem --version, not gems. On Dec 22, 2007 8:04 AM, Li Chen [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > ## thank you very much, Li > > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). > > > – Ryan B. > **[frozenplague.net](http://www.frozenplague.net)** > > This domain may be for sale! ---
**Author:** ![alex-osu3](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/13edae/32.png) [@alex-osu3](https://www.ruby-forum.com/u/alex-osu3)\ **Post date:** [December 23, 2007, 10:08pm UTC](https://www.ruby-forum.com/t/how-to-check-if-gems-is-installed/123908/3 "2007-12-23T22:08:37Z")
Ryan B. wrote: > Try gem --version, not gems. > Ryan B. > [http://www.frozenplague.net](http://www.frozenplague.net) It doesn’t work either. Li ---
**Author:** ![alex-osu3](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/13edae/32.png) [@alex-osu3](https://www.ruby-forum.com/u/alex-osu3)\ **Post date:** [December 23, 2007, 11:46pm UTC](https://www.ruby-forum.com/t/how-to-check-if-gems-is-installed/123908/4 "2007-12-23T23:46:14Z")
Then you might not have the ruby folder on the PATH variable in windows. Right-click My Computer → Properties → Advanced → Environment Variables and add the path to ruby at the end of the PATH. On Dec 24, 2007 7:38 AM, Li Chen [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). > > > – Ryan B. > **[frozenplague.net](http://www.frozenplague.net)** > > This domain may be for sale! Feel free to add me to MSN and/or GTalk as this email. ---
**Author:** ![alex-osu3](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/13edae/32.png) [@alex-osu3](https://www.ruby-forum.com/u/alex-osu3)\ **Post date:** [December 24, 2007, 4:42pm UTC](https://www.ruby-forum.com/t/how-to-check-if-gems-is-installed/123908/5 "2007-12-24T16:42:10Z")
Ryan B. wrote: > Then you might not have the ruby folder on the PATH variable in windows. > > Right-click My Computer → Properties → Advanced → Environment > Variables > and add the path to ruby at the end of the PATH. > > > Ryan B. > > [http://www.frozenplague.net](http://www.frozenplague.net) I have no problem check ruby version and gem version from any directory when I install Ruby on window XP after I add the path to the system environment. But I now I follow the same method to install Ruby on Vista. I can check ruby version from any directory after adding the path to the system environment variable BUT NOT that of gem. I went to gems’ website, which suggests to add RUBYOPT variable with value as rubygems. I follow it and it doesn’t work either. I wonder if there is some compatibility Ruby with Vista. Thanks, Li