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请问 SUM 的用处?
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sleeve@magic:~[601]$ man sum
- User Commands sum(1)
- NAME
- sum - print checksum and block count for a file
- SYNOPSIS
- sum [ -r ] [ file ... ]
- DESCRIPTION
- The sum utility calculates and prints a 16-bit checksum for
- the named file and the number of 512-byte blocks in the
- file. It is typically used to look for bad spots, or to
- validate a file communicated over some transmission line.
- OPTIONS
- The following options are supported:
- -r Use an alternate (machine-dependent) algorithm in com-
- puting the checksum.
- OPERANDS
- The following operands are supported:
- file A path name of a file. If no files are named, the
- standard input is used.
- USAGE ....
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