Removing all installed gems
| gem list | cut -d" " -f1 | xargs gem uninstall -aIx | |
| gem list | grep -v 'test-unit\|psych\|rdoc\|minitest\|json\|io-console\|bigdecimal\|rake' | cut -d" " -f1 | xargs gem uninstall -aIx |
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