Thanks pepe,
RobsMacAir:~ rob$ rails -v
Rails 2.3.8
RobsMacAir:~ rob$ gem uninstall my_gem -v=2.3.8
ERROR: While executing gem ... (Gem::InstallError)
Unknown gem my_gem = 2.3.8
RobsMacAir:~ rob$
??
I want to uninstall everything besides 2.2.2
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