#Bash 的 b2sum 命令
b2sum [OPTION]... [FILE]...
功能
计算或校验 BLAKE2 值。
类型
可执行文件（/usr/bin/b2sum），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 BLAKE2 值进行校验-l,--length=BITS- 结果保留的长度（位），不能超过 512 且必须是 8 的倍数--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 BLAKE2 值
$ b2sum 1.txt # 单个文件
364dce569668afdf7620e6a0a118c7ef718f4df1b419333cd41373d1af91ccc4f619b1a245c543e715bc6c3d95871c0936f94b7875687bd09154e4af70cfd987 1.txt
$ b2sum -l 64 1.txt # 结果保留 64 位
31e4af026ab94028 1.txt
$ b2sum 1.txt 2.txt 3.txt # 多个文件
364dce569668afdf7620e6a0a118c7ef718f4df1b419333cd41373d1af91ccc4f619b1a245c543e715bc6c3d95871c0936f94b7875687bd09154e4af70cfd987 1.txt
cdf8234a9831d36804b2ccf54288127cbe6c876a9167d9f863334c9714ccfa8d73e9b644819e2ec37b17de1c5d7381d5c7d1806f6bd021dcfda5def7e958e336 2.txt
b9fd7b32f6e9ecaa4f48b1bb22a160fe716c67835e8d2e67f0a3fb2f3b6cdd266499d2e1926dfae79c436202e8136ff930e8bf384899dd7be7ae4ee7b12afa4e 3.txt
$ b2sum --tag 1.txt 2.txt 3.txt # BSD 风格
BLAKE2b (1.txt) = 364dce569668afdf7620e6a0a118c7ef718f4df1b419333cd41373d1af91ccc4f619b1a245c543e715bc6c3d95871c0936f94b7875687bd09154e4af70cfd987
BLAKE2b (2.txt) = cdf8234a9831d36804b2ccf54288127cbe6c876a9167d9f863334c9714ccfa8d73e9b644819e2ec37b17de1c5d7381d5c7d1806f6bd021dcfda5def7e958e336
BLAKE2b (3.txt) = b9fd7b32f6e9ecaa4f48b1bb22a160fe716c67835e8d2e67f0a3fb2f3b6cdd266499d2e1926dfae79c436202e8136ff930e8bf384899dd7be7ae4ee7b12afa4e
校验 BLAKE2 值
$ b2sum 1.txt 2.txt 3.txt > sum.txt
$ b2sum -c sum.txt # 校验
1.txt: OK
2.txt: OK
3.txt: OK
#推荐阅读
#手册
B2SUM(1) User Commands B2SUM(1)
NAME
b2sum - compute and check BLAKE2 message digest
SYNOPSIS
b2sum [OPTION]... [FILE]...
DESCRIPTION
Print or check BLAKE2b (512-bit) checksums.
With no FILE, or when FILE is -, read standard input.
Mandatory arguments to long options are mandatory for short options
too.
-b, --binary
read in binary mode
-c, --check
read checksums from the FILEs and check them
-l, --length=BITS
digest length in bits; must not exceed the max for the blake2
algorithm and must be a multiple of 8
--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 7693. 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.
AUTHOR
Written by Padraig Brady and Samuel Neves.
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/b2sum>
or available locally via: info '(coreutils) b2sum invocation'
GNU coreutils 9.4 April 2024 B2SUM(1)