comm.1

UNIX v6源代码 这几乎是最经典的unix版本 unix操作系统设计和莱昂氏unix源代码分析都是用的该版

.th COMM I 5/15/74
.sh NAME
comm \*- print lines common to two files
.sh SYNOPSIS
.bd comm
[
.bd \*-
[
.bd 123
]
] file1 file2
.sh DESCRIPTION
.it Comm
reads
.it file1
and
.it file2,
which should be in sort,
and produces a three column output: lines only in
.it file1;
lines only in
.it file2;
and lines in both files.
The filename `\*-' means the standard input.
.s3
Flags 1, 2, or 3 suppress printing of the corresponding
column.
Thus
.bd comm
.bd \*-12
prints only the lines common to the two files;
.bd comm
.bd \*-23
prints only lines in the first file but not in the second;
.bd comm
.bd \*-123
is a no-op.
.s3
.sh "SEE ALSO"
cmp (I), diff (I)
.sh BUGS