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貌似明白了些:
of=file
Specifies the output path. Standard output is the
default. If the seek=expr conversion is not also
specified, the output file will be truncated before
the copy begins, unless conv=notrunc is specified. If
seek=expr is specified, but conv=notrunc is not, the
effect of the copy will be to preserve the blocks in
the output file over which dd seeks, but no other por-
tion of the output file will be preserved. (If the
size of the seek plus the size of the input file is
less than the previous size of the output file, the
output file is shortened by the copy.)
就是指直接在原文件上做改动,是不是这个意思? |
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