cmp - compare two files
cmp [-l] [-s] file1 file2 [skip1] [skip2]
The cmp utility compares two files. cmp will write no output
if the files are the same. Under default options, if they
differ, it writes to standard output the byte and line
numbers at which the first difference occurred. Bytes and
lines are numbered beginning with 1. If one file is an ini-
tial subsequence of the other, that fact is noted. skip1 and
skip2 are initial byte offsets into file1 and file2 respec-
tively, and may be either octal or decimal; a leading 0
The following options are supported:
-l Write the byte number (decimal) and the differing
bytes (octal) for each difference.
-s Write nothing for differing files; return exit sta-
The following operands are supported:
file1 A path name of the first file to be compared. If file1
is -, the standard input will be used.
file2 A path name of the second file to be compared. If
file2 is -, the standard input will be used.
If both file1 and file2 refer to standard input or refer to
the same FIFO special, block special or character special
file, an error results.
See largefile(5) for the description of the behavior of cmp
when encountering files greater than or equal to 2 Gbyte (2
Example 1: Comparing files byte for byte
The following example:
example% cmp file1 file2 0 1024
does a byte for byte comparison of file1 and file2. It skips
the first 1024 bytes in file2 before starting the com-
See environ(5) for descriptions of the following environment
variables that affect the execution of cmp: LANG, LC_ALL,
LC_CTYPE, LC_MESSAGES, and NLSPATH.
The following error values are returned:
0 The files are identical.
1 The files are different; this includes the case where
one file is identical to the first part of the other.
>1 An error occurred.
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Availability | SUNWcsu |
| CSI | enabled |
| Interface Stability | Standard |
comm(1), diff(1), attributes(5), environ(5), largefile(5),
Man(1) output converted with