ref: 43de7b8419fa3582af6df803473ef1bde2ce5c23
dir: /man/1/comm/
.TH COMM 1 .SH NAME comm \- select or reject lines common to two sorted files .SH SYNOPSIS .B comm [ .B -123 ] .I file1 file2 .SH DESCRIPTION .I Comm reads lines from .I file1 and .IR file2 , which are in lexicographical order, and produces a three column output: lines only in .IR file1 ; lines only in .IR file2 ; and lines in both files. The file name .L - means the standard input. .PP Each option digit .LR 1 , .LR 2 , or .LR 3 suppresses printing of the corresponding column. .SH EXAMPLE .TP .EX comm -12 file1 file2 .EE .IP Print lines common to two sorted files. .SH SOURCE .B /appl/cmd/comm.b .SH "SEE ALSO" .IR sort (1), .IR cmp (1), .IR diff (1), .IR uniq (1)