.th SUM I 5/31/77 .sh NAME sum \*- print checksum of a file .sh SYNOPSIS .bd sum [ file ] ... .sh DESCRIPTION .it Sum sums the contents of the bytes (mod 2^16) of each .it file specified. .it Sum prints the file name, the number of whole or partial 512-byte disk blocks read, and the summed value of its bytes in decimal. .sp In practice, .it sum is often used to vertify that all of a special file can be read without error.