元ネタはこちら Loop background job - StackOverflow
直列にやっちゃう
for v in {2.2.2,2.2.3,2.2.4,2.2.5}; do rbenv install $v ; done
バックグラウンドジョブとして起動
for v in {2.2.2,2.2.3,2.2.4,2.2.5}; do rbenv install $v & done
&に変えただけだが，複数コアあるなら有効活用できる．
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