SUM(1) SUM(1) NAME sum - sum and count blocks in a file SYNOPSIS sum file DESCRIPTION _S_u_m 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 trans‐ mission line. SEE ALSO wc(1) DIAGNOSTICS ‘Read error’ is indistinguishable from end of file on most devices; check the block count. 7th Edition April 29, 1985 SUM(1)