#Bash 的 md5sum 命令

1md5sum [OPTION]... [FILE]...
2

功能

计算或校验 MD5 值。

类型

可执行文件（/usr/bin/md5sum），属于 coreutils。

参数

OPTION 选项：
- -b, --binary - 以二进制模式读取文件；类 UNIX 系统下始终是二进制模式
- -c, --check - 从文件中读取 MD5 值进行校验
- --tag- 生成 BSD 风格的输出
- -t, --text - 以文本模式读取文件；类 UNIX 系统下不存在文本模式，此选项无效
- -z, --zero - 以空字符（\0）作为行的结尾，而不是换行符（\n）
- --ignore-missing - 校验时忽略缺失的文件
- --quiet - 校验时不打印成功的消息
- --status - 校验时不打印任何消息；可以通过返回值检查是否成功
- --strict - 校验时严格检查格式
- -w, --warn - 校验时遇到格式不正确的行时产生警告
- --help - 显示帮助
- --version - 显示版本
FILE - 文件列表

#示例

计算 MD5 值

1$ md5sum 1.txt                                   # 单个文件
279171af5e65e23a97b58c343c4de7411  1.txt
3$ md5sum 1.txt 2.txt 3.txt                       # 多个文件
479171af5e65e23a97b58c343c4de7411  1.txt
5d68dae595d597fb67c85a8301521b097  2.txt
672d93867588107cf46b2cc7ea400d0aa  3.txt
7$ md5sum --tag 1.txt 2.txt 3.txt                 # BSD 风格
8MD5 (1.txt) = 79171af5e65e23a97b58c343c4de7411
9MD5 (2.txt) = d68dae595d597fb67c85a8301521b097
10MD5 (3.txt) = 72d93867588107cf46b2cc7ea400d0aa
11

校验 MD5 值

1$ md5sum 1.txt 2.txt 3.txt > md5.txt
2$ md5sum -c md5.txt # 校验
31.txt: OK
42.txt: OK
53.txt: OK
6

#相关命令

命令	说明
b2sum	计算和校验 BLAKE2 值
sha1sum	计算和校验 SHA1 值
sha224sum	计算和校验 SHA224 值
sha256sum	计算和校验 SHA256 值
sha384sum	计算和校验 SHA384 值
sha512sum	计算和校验 SHA512 值

#推荐阅读

#手册

显示

1MD5SUM(1)                        User Commands                       MD5SUM(1)
2
3NAME
4       md5sum - compute and check MD5 message digest
5
6SYNOPSIS
7       md5sum [OPTION]... [FILE]...
8
9DESCRIPTION
10       Print or check MD5 (128-bit) checksums.
11
12       With no FILE, or when FILE is -, read standard input.
13
14       -b, --binary
15              read in binary mode
16
17       -c, --check
18              read checksums from the FILEs and check them
19
20       --tag  create a BSD-style checksum
21
22       -t, --text
23              read in text mode (default)
24
25       -z, --zero
26              end  each  output  line  with NUL, not newline, and disable file
27              name escaping
28
29   The following five options are useful only when verifying checksums:
30       --ignore-missing
31              don't fail or report status for missing files
32
33       --quiet
34              don't print OK for each successfully verified file
35
36       --status
37              don't output anything, status code shows success
38
39       --strict
40              exit non-zero for improperly formatted checksum lines
41
42       -w, --warn
43              warn about improperly formatted checksum lines
44
45       --help display this help and exit
46
47       --version
48              output version information and exit
49
50       The sums are computed as described in RFC 1321.  When checking, the in‐
51       put should be a former output of this program.  The default mode is  to
52       print a line with: checksum, a space, a character indicating input mode
53       ('*'  for  binary,  ' ' for text or where binary is insignificant), and
54       name for each FILE.
55
56       Note: There is no difference between binary mode and text mode  on  GNU
57       systems.
58
59BUGS
60       Do  not  use the MD5 algorithm for security related purposes.  Instead,
61       use an SHA-2  algorithm,  implemented  in  the  programs  sha224sum(1),
62       sha256sum(1),  sha384sum(1), sha512sum(1), or the BLAKE2 algorithm, im‐
63       plemented in b2sum(1)
64
65AUTHOR
66       Written by Ulrich Drepper, Scott Miller, and David Madore.
67
68REPORTING BUGS
69       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
70       Report any translation bugs to <https://translationproject.org/team/>
71
72COPYRIGHT
73       Copyright © 2023 Free Software Foundation, Inc.   License  GPLv3+:  GNU
74       GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
75       This  is  free  software:  you  are free to change and redistribute it.
76       There is NO WARRANTY, to the extent permitted by law.
77
78SEE ALSO
79       cksum(1)
80
81       Full documentation <https://www.gnu.org/software/coreutils/md5sum>
82       or available locally via: info '(coreutils) md5sum invocation'
83
84GNU coreutils 9.4                 April 2024                         MD5SUM(1)
85

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