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Linux in a Nutshell, Fourth Edition by Aaron Weber, Stephen Figgins, Ellen Siever

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Name

sum

Synopsis

                  sum [options] files
               

Calculate and print a checksum and the number of (1KB) blocks for file. If no files are specified, or file is -, read from standard input. Useful for verifying data transmission.

Options

-r

The default setting. Use the BSD checksum algorithm.

-s, --sysv

Use alternate checksum algorithm as used on System V. The blocksize is 512 bytes.

--help

Print a help message and then exit.

--version

Print the version number and then exit.

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