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@highfrontier

コマンドラインで集合演算

Last updated at Posted at 2014-03-26

コマンド出力の差分に対してとある処理をしたかったので汎用部分をまとめてみた
入力A
$ cat A
a
b
c
a
b
c

入力B
$ cat B
A
b
C
A
b
C

積集合
$ join <(cat A|sort -u) <(cat B|sort -u)
b

差集合
$ cat <(cat A|sort -u) <(join <(cat A|sort -u) <(cat B|sort -u) ) | sort | uniq -u
a
c

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