The usage of the Linux basic command cmp
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Cmp
Compare the differences between the two files in bytes, but do not save the results of the operation. The Cmp instruction only sets the relevant flag bits based on the result, which is often followed by a conditional jump instruction. The scope of this command: RedHat, RHEL, Ubuntu, CentOS, SUSE, openSUSE, Fedora.
1. Grammar
Cmp [OPTION]... FILE1 [FILE2 [SKIP1 [SKIP2]
2. List of options
Option
Description
-v |-- version
Display command version information
-- help
Show help documentation
-b |-- print-bytes
Output different bytes
-I num |-- ignore-initial=num
Skip the first num bytes
-I num1 num2 |-- ignore-initial=num1:num2
The first file skips num1 bytes and the second file skips num2 bytes
-l |-- verbose
Output the byte sequence number of the difference, as well as the value of this byte
-n LIMIT |-- bytes=LIMIT
Compare LIMIT bytes at most
-s |-- quiet |-- silent
Do not output; only output exit status
3. Examples
1) Direct comparison
[root@localhost weijie] # diff-y 1.c 2.c / / first use diff to see the differences
Asd | ase
Sdf | sdd
Dfg dfg
[root@localhost weijie] # cmp 1.c 2.c / / start comparison
1.c 2.c differ: byte 3, line 1 / / shows only the first difference, the first line, the third byte
2) use the option-b to show the different bytes
[root@localhost weijie] # cmp-b 1.c 2.c
1.c 2.c differ: byte 3, line 1 is 144d 144e / / shows different places, the first file is d and the second file is e. But there's only the first difference here.
3) use the option-l to show all the differences
[root@localhost weijie] # cmp-lb 1.c 2.c / / uses both l and b options
3 144 d 145 e / / the first difference
7 146 f 144 d / / the second difference
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