Unix |
Unix v7 |
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sum(1) |
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sum − sum and count blocks in a file
sum file
Sum calculates and prints a 16-bit checksum for the named file, and also prints the number of blocks in the file. It is typically used to look for bad spots, or to validate a file communicated over some transmission line.
wc(1)
’Read error’ is indistinuishable from end of file on most devices; check the block count.
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sum(1) | ![]() |