#Bash 的 md5sum 命令

md5sum [OPTION]... [FILE]...

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

$ md5sum file                                       # 单个文件
79171af5e65e23a97b58c343c4de7411  1.txt
$ md5sum 1.txt 2.txt 3.txt                          # 多个文件
79171af5e65e23a97b58c343c4de7411  1.txt
d68dae595d597fb67c85a8301521b097  2.txt
72d93867588107cf46b2cc7ea400d0aa  3.txt
$ md5sum --tag 1.txt 2.txt 3.txt                    # BSD 风格
MD5 (1.txt) = 79171af5e65e23a97b58c343c4de7411
MD5 (2.txt) = d68dae595d597fb67c85a8301521b097
MD5 (3.txt) = 72d93867588107cf46b2cc7ea400d0aa

校验 MD5 值

$ md5sum 1.txt 2.txt 3.txt > md5.txt
$ md5sum -c md5.txt # 校验
1.txt: OK
2.txt: OK
3.txt: OK

#推荐阅读

#手册


MD5SUM(1)                        User Commands                       MD5SUM(1)

NAME
       md5sum - compute and check MD5 message digest

SYNOPSIS
       md5sum [OPTION]... [FILE]...

DESCRIPTION
       Print or check MD5 (128-bit) checksums.

       With no FILE, or when FILE is -, read standard input.

       -b, --binary
              read in binary mode

       -c, --check
              read checksums from the FILEs and check them

       --tag  create a BSD-style checksum

       -t, --text
              read in text mode (default)

       -z, --zero
              end  each  output  line  with NUL, not newline, and disable file
              name escaping

   The following five options are useful only when verifying checksums:
       --ignore-missing
              don't fail or report status for missing files

       --quiet
              don't print OK for each successfully verified file

       --status
              don't output anything, status code shows success

       --strict
              exit non-zero for improperly formatted checksum lines

       -w, --warn
              warn about improperly formatted checksum lines

       --help display this help and exit

       --version
              output version information and exit

       The sums are computed as described in RFC 1321.  When checking, the in‐
       put should be a former output of this program.  The default mode is  to
       print a line with: checksum, a space, a character indicating input mode
       ('*'  for  binary,  ' ' for text or where binary is insignificant), and
       name for each FILE.

       Note: There is no difference between binary mode and text mode  on  GNU
       systems.

BUGS
       Do  not  use the MD5 algorithm for security related purposes.  Instead,
       use an SHA-2  algorithm,  implemented  in  the  programs  sha224sum(1),
       sha256sum(1),  sha384sum(1), sha512sum(1), or the BLAKE2 algorithm, im‐
       plemented in b2sum(1)

AUTHOR
       Written by Ulrich Drepper, Scott Miller, and David Madore.

REPORTING BUGS
       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
       Report any translation bugs to <https://translationproject.org/team/>

COPYRIGHT
       Copyright © 2023 Free Software Foundation, Inc.   License  GPLv3+:  GNU
       GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
       This  is  free  software:  you  are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       cksum(1)

       Full documentation <https://www.gnu.org/software/coreutils/md5sum>
       or available locally via: info '(coreutils) md5sum invocation'

GNU coreutils 9.4                 April 2024                         MD5SUM(1)

#Bash 的 md5sum 命令

#示例

#推荐阅读

#手册

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