SUM(1B) BSD Compatibility Package Commands SUM(1B)

NAME

sum - calculate a checksum for a file

SYNOPSIS

/usr/ucb/sum file...

DESCRIPTION

sum 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 ints and machines
with 32-bit ints, so it cannot always be used to validate that a file
has been transferred between machines with different-sized ints.

USAGE

See largefile(7) for the description of the behavior of sum when
encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).

SEE ALSO

sum(1), wc(1), attributes(7), largefile(7)

DIAGNOSTICS

Read error is indistinguishable from EOF on most devices; check the
block count.

NOTES

sum and /usr/bin/sum (see sum(1)) return different checksums.


This utility is obsolete.

November 8, 1995 SUM(1B)