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- SSSSUUUUMMMM((((1111)))) SSSSUUUUMMMM((((1111))))
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- NNNNAAAAMMMMEEEE
- sum - print checksum and block count of a file
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- ssssuuuummmm [ ----rrrr ] file
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- _s_u_m calculates and prints a 16-bit checksum for the named file, and also
- prints the number of blocks in the file. NNNNUUUULLLLLLLL characters (with ASCII
- value zero) are ignored in computing the checksum. _s_u_m is typically used
- to look for bad spots, or to validate a file communicated over some
- transmission line. The option ----rrrr causes an alternate algorithm to be
- used in computing the checksum. This alternate algorithm does not ignore
- NULL characters.
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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- wc(1).
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- DDDDIIIIAAAAGGGGNNNNOOOOSSSSTTTTIIIICCCCSSSS
- ``Read error'' is indistinguishable from end of file on most devices;
- check the block count.
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- PPPPaaaaggggeeee 1111
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