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.TH COMM 1 "2026-09-01"
.SH NAME
comm \- Compare two sorted files line by line.

When FILE1 or FILE2 (not both) is \-, read standard input.

With no options, produce three\-column output. Column one contains
lines unique to FILE1, column two contains lines unique to FILE2,
and column three contains lines common to both files.
.SH SYNOPSIS
\fBcomm\fR [OPTION]... FILE1 FILE2
.SH DESCRIPTION
Compare two sorted files line by line.
.PP
When FILE1 or FILE2 (not both) is \-, read standard input.
.PP
With no options, produce three\-column output. Column one contains
lines unique to FILE1, column two contains lines unique to FILE2,
and column three contains lines common to both files.
.SH OPTIONS
.TP
\fB\-1\fR
suppress column 1 (lines unique to FILE1)
.TP
\fB\-2\fR
suppress column 2 (lines unique to FILE2)
.TP
\fB\-3\fR
suppress column 3 (lines that appear in both files)
.TP
\fB\-\-output\-delimiter\fR \fI<STR>\fR
separate columns with STR
.TP
\fB\-z\fR, \fB\-\-zero\-terminated\fR
line delimiter is NUL, not newline
.TP
\fB\-\-total\fR
output a summary
.TP
\fB\-\-check\-order\fR
check that the input is correctly sorted, even if all input lines are pairable
.TP
\fB\-\-nocheck\-order\fR
do not check that the input is correctly sorted
.TP
\fB\-h\fR, \fB\-\-help\fR
Print help
.TP
\fB\-V\fR, \fB\-\-version\fR
Print version
.TP
<\fIFILE1\fR>

.TP
<\fIFILE2\fR>

.SH VERSION
v(uutils coreutils) 0.11.0