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BSD 4.3reno

.\" 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.

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