.\" Copyright (c) 1990 Regents of the University of California. .\" All rights reserved. The Berkeley software License Agreement .\" specifies the terms and conditions for redistribution. .\" .\" @(#)sum.1 6.2 (Berkeley) 6/24/90 .\" .TH SUM 1 "%Q" .AT 3 .SH NAME sum \- sum and count blocks in a file .SH SYNOPSIS .B sum file .SH DESCRIPTION .I Sum 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 transmission line. .SH "SEE ALSO" wc(1) .SH DIAGNOSTICS `Read error' is indistinguishable from end of file on most devices; check the block count.