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awkでディレクトリ内のファイル名の差集合と積集合を出力

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差集合の出力コマンド

# dir2にのみ存在するファイルを出力
awk 'NR==FNR{a[$0]}!($0 in a)' <(ls dir1/) <(ls dir2/)

積集合の出力コマンド

# dir1とdir2の両方に存在するファイルを出力
awk '$0 in a;{a[$0]}' <(ls dir1/) <(ls dir2/)
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