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# 追記
@7of9 さんの投稿がもっと良い解決策に感じました

set -o noclobber
で、既存ファイルに対して > が使えなくなるそうです


echo export PATH='/path/to/bin:$PATH' >> ~/.bashrc

> の数がtypoで一つ少ないと、ファイルが上書きされて詰んでしまうのでなるべくエディタを使いましょう

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