個人的なメモ。
default gem以外のすべてのgemを削除する方法。
これまでのやり方では
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| gem uninstall -axI `gem list --no-versions` | |
| ERROR: While executing gem ... (Gem::InstallError) | |
| gem "bigdecimal" cannot be uninstalled because it is a default gem |
ということでエラーになった。
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| for i in `gem list --no-versions`; do gem uninstall -aIx $i; done |
default gemをuninstall時にエラーは出るけど、無視されるっぽい。
参考: http://stackoverflow.com/questions/15100496/uninstalling-all-gems-ruby-2-0-0