ruby on rails - Windows Gem Installation -

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i'm newbie ruby on rails. had quick question installing gems.

i'm using windows 7 64 bit machine ruby 1.9.2 , rails 3.0 , i'm trying install gravatar_image_tag gem.

gem install gravatar_image_tag

after run says succcessful. when try this:

gravatar_image_tag -v

it says 'gravatar_image_tag' not recognized internal or external command, operable program or batch file'

when looked ruby192/bin file there batch files rails, annotate etc etc work fine there's not batch file gravatar_image_tag.

i wondering i'm going wrong this.

thanks in advance.

not gems executable command line. best way see if gem installed (as version) run: 

gem list

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