礼儀正しい.bakファイルの作り方 
バックアップファイルの作り方。20年近く前に教えてもらったもの。リビジョン管理が発達したせいか、知らない人が多かったので書いてみる。
cp foobar foobar.bak
とするのではなくて、
mv foobar foobar.bak cp foobar.bak foobar
とする。こうすることでタイムスタンプやらi-nodeやらも保持される。これは、
mv foobar{,.bak}
cp foobar{.bak,}
とも書ける。csh系であれば
alias bak 'mv \!^{,.bak}; cp \!^{.bak,}'
としておくと便利。bashのことはよくわからない。
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