'\" te
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.TH sum 1B "8 Nov 1995" "SunOS 5.11" "SunOS/BSD Compatibility Package Commands"
.SH NAME
sum \- calculate a checksum for a file
.SH SYNOPSIS
.LP
.nf
\fB/usr/ucb/sum\fR \fIfile\fR...
.fi

.SH DESCRIPTION
.sp
.LP
\fBsum\fR calculates and displays a 16-bit checksum for the named file and
displays the size of the file in kilobytes. It is typically used to look for
bad spots, or to validate a file communicated over some transmission line. The
checksum is calculated by an algorithm which may yield different results on
machines with 16-bit \fBint\fRs and machines with 32-bit \fBint\fRs, so it
cannot always be used to validate that a file has been transferred between
machines with different-sized \fBint\fRs.
.SH USAGE
.sp
.LP
See \fBlargefile\fR(5) for the description of the behavior of \fBsum\fR when
encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
.SH SEE ALSO
.sp
.LP
\fBsum\fR(1), \fBwc\fR(1), \fBattributes\fR(5), \fBlargefile\fR(5)
.SH DIAGNOSTICS
.sp
.LP
\fBRead error\fR is indistinguishable from \fBEOF\fR on most devices; check the
block count.
.SH NOTES
.sp
.LP
\fBsum\fR and \fB/usr/bin/sum\fR (see \fBsum\fR(1)) return different checksums.
.sp
.LP
This utility is obsolete.