SysIII/usr/src/man/man1/sum.1

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.TH SUM 1 
.SH NAME
sum \- sum and count blocks in a file
.SH SYNOPSIS
.B sum
[
.B \-r
]
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.
The option
.B \\-r
causes an alternate algorithm to be used
in computing the checksum.
.SH "SEE ALSO"
wc(1).
.SH DIAGNOSTICS
``Read error''
is indistinguishable from end of file on
most devices; check the block count.