SUM(1B) BSD Compatibility Package Commands SUM(1B)
sum - calculate a checksum for a file
/usr/ucb/sum file...
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.
See largefile(7) for the description of the behavior of sum when
encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
sum(1), wc(1), attributes(7), largefile(7)
Read error is indistinguishable from EOF on most devices; check the
block count.
sum and /usr/bin/sum (see sum(1)) return different checksums.
This utility is obsolete.
November 8, 1995 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This utility is obsolete.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)