joinコマンド

2つのファイル中のレコードを連結するにはjoinコマンドが便利。
ファイルの1つ目のフィールドをキーとして対応する値を連結して表示する。
出力は
キー、ファイル1の値(複数)、ファイル2の値(複数)
となる。
catが行の連結なのに対して、joinは列の連結。

>join -t ',' file1 file2

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