cmp.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 CMP I 5/15/74
.sh NAME
cmp \*- compare two files
.sh SYNOPSIS
.bd cmp
[
.bd \*-l
] [
.bd \*-s
]
file1 file2
.sh DESCRIPTION
The two files are
compared.
(If
.it file1
is `\*-',
the standard input is used.)
Under default options,
.it cmp
makes no comment if the files are the same;
if they differ, it announces the byte and line number
at which the difference occurred.
If one file is an initial subsequence
of the other, that fact is noted.
Moreover, return code 0 is yielded for identical
files, 1 for different files, and 2 for an
inaccessible or missing argument.
.s3
Options:
.s3
.lp +6 3
\fB\*-l\fR	Print the byte number (decimal) and the
differing bytes (octal) for each difference.
.s3
.lp +6 3
\fB\*-s\fR	Print nothing for differing files;
return codes only.
.i0
.dt
.sh "SEE ALSO"
diff (I), comm (I)
.sh BUGS