sum(1B)

Name | Synopsis | Description | Usage | Attributes | See Also | Diagnostics | Notes

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(5) for the description of the behavior of sum when encountering files greater than or equal to 2 Gbyte ( 2³¹ bytes).

Attributes

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Availability	SUNWscpu

See Also

sum(1), wc(1), attributes(5), largefile(5)

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This utility is obsolete.

SunOS 5.11  Last Revised 8 Nov 1995

Name | Synopsis | Description | Usage | Attributes | See Also | Diagnostics | Notes