Manual page for SUM(1V)
sum - calculate a checksum for a file
SYNOPSIS
sum
filename
SYSTEM V SYNOPSIS
/usr/5bin/sum
[
-r
]
filename
AVAILABILITY
The System V version of this command is available with the
System V
software installation option. Refer to
[a manual with the abbreviation INSTALL]
for information on how to install optional software.
DESCRIPTION
sum
calculates and displays a 16-bit checksum for the named file,
and also 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.
SYSTEM V DESCRIPTION
sum
calculates and prints a 16-bit checksum for the named file,
and also prints the number of 512-byte blocks in the file.
It is typically used to look for bad spots, or
to validate a file communicated over
some transmission line.
This algorithm is independent of the size of
ints
on the machine.
SYSTEM V OPTIONS
The option
-r
causes the (machine-dependent) algorithm used by the non-System V
sum
to be used in computing the checksum.
SEE ALSO
wc.1
DIAGNOSTICS
Read error
is indistinguishable from
EOF
on most devices; check the block count.
Created by unroff & hp-tools.
© somebody (See intro for details). All Rights Reserved.
Last modified 11/5/97
