some one-liners that are often useful: cat a b | sort | uniq > c # c = a union b cat a b | sort | uniq -d > c # c = a intersect b cat a b b

some one-liners that are often useful: cat a b | sort | uniq > c # c = a union b cat a b | sort | uniq -d > c # c = a intersect b cat a b b | sort | uniq -u > c # c = set difference a - b