该shasum实用程序有一个-p/--portable选项,描述如下:
-p, --portable read files in portable mode
produces same digest on Windows/Unix/Mac
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我从未见过包含此选项会更改文件的摘要,而且我也不确定它应该具有什么效果。这种读取文件的“便携模式”是什么?
对于它的价值,沙苏姆说:
-p, --portable 以便携模式读取(已弃用)
据我所知(我不是 Perl 专家),它似乎是为了考虑不同的 EOL 字符。
源代码中说道:
The sums are computed as described in FIPS PUB 180-2. When checking, the
input should be a former output of this program. The default mode is to
print a line with checksum, a character indicating type (`*' for binary,
`?' for portable, ` ' for text), and name for each FILE.
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...
# Try to figure out if the OS is DOS-like. If it is,
# default to binary mode when reading files, unless
# explicitly overriden by command line "--text" or
# "--portable" options.
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...
我很高兴 Perl 专家能够查看完整的源代码并确认我的答案。
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