sum

sum [option] file

Calculate and print a checksum and the number of (512-byte) blocks for file. Possibly useful for verifying data transmission. See also cksum in Chapter 2.

Note: /usr/ucb/sum reports sizes in kilobytes, while /usr/bin/sum reports sizes in 512-byte blocks, even with the -r option.

Option

-r

Use an alternate checksum algorithm; this produces the same results as the BSD version of sum.