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-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 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
选项 | 说明 |
-b | 以二进制模式读取文件 |
-t | 以文本模式读入文件内容 |
-c | 根据已生成的md5值,对现存文件进行校验 |
-w | 检查输入的md5信息有没有非法行,若有则输出相应信息 |
–status | 校验完成后,不生成错误或正确的提示信息,可以通过命令的返回值来判断 |
实例
md5sum libnim.so
5ef2e45e1890736413407299ecc2786a libnim.so
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审核编辑:汤梓红
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