Linux获取文件MD5码命令md5sum详解

概述

md5sum 用于计算和校验文件的MD5值。

md5sum 常常被用来验证网络文件传输的完整性，防止文件被人篡改。在日常工作当中，我们可以用来判断系统中的重要文件是否被篡改。传文件给别人时确认是否一致。

还可以使用使用 md5sum 生成文件或用户的密码。

语法

该命令的语法如下：

md5sum [选项] 文件
新命令老套路先help

md5sum --help

Usage: md5sum [OPTION]... [FILE]...

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 MD5 sums from the FILEs and check them

--tag create a BSD-style checksum

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

The following five options are useful only when verifying checksums:

--ignore-missingdon'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

--versionoutput version information and exit

The sums are computed as described in RFC 1321.When checking, the input

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.

GNU coreutils online help:

Full documentation at:

or available locally via: info '(coreutils) md5sum invocation'

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主要参数讲解

实例

md5sum libnim.so

5ef2e45e1890736413407299ecc2786alibnim.so

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审核编辑：汤梓红