NAME

comm − select or reject lines common to two sorted files

SYNOPSIS

­comm [ ­-123 ] ­file1 file2

DESCRIPTION

­Comm reads ­file1 and ­file2, which are ordered in ASCII collating sequence, and produces a three column output: lines only in file1; lines only in file2; and lines in both files. The file name ­- means the standard input. 

Flag 1, 2, or 3 suppresses printing of the corresponding column. 

EXAMPLES

comm -12 file1 file2
Print lines common to two sorted files.

deroff -w /mail/lib/names.last | tr a-z A-Z | sort -u >temp

spell temp | comm -13 - temp
Print names that are known both to mail(1) and spell(1)

SEE ALSO

sort(1), cmp(1), diff(1), uniq(1)

Plan 9  —  January 03, 1993