sum(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPERANDS | USAGE | ENVIRONMENT VARIABLES | EXIT STATUS | ATTRIBUTES | SEE ALSO | DIAGNOSTICS | NOTES

NAME

sum– print checksum and block count for a file

SYNOPSIS

sum [-r] [file…]

DESCRIPTION

The sum utility calculates and prints a 16-bit checksum for the named file and 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.

OPTIONS

The following options are supported:

-r

Use an alternate (machine-dependent) algorithm in computing the checksum.

OPERANDS

The following operands are supported:

file

A path name of a file. If no files are named, the standard input is used.

USAGE

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

ENVIRONMENT VARIABLES

See environ(5) for descriptions of the following environment variables that affect the execution of sum: LC_CTYPE, LC_MESSAGES, and NLSPATH.

EXIT STATUS

The following exit values are returned.

0

Successful completion.

>0

An error occurred.

ATTRIBUTES

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

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Availability	SUNWesu
CSI	enabled

SEE ALSO

cksum(1), sum(1B), wc(1), attributes(5), environ(5), largefile(5)

DIAGNOSTICS

“Read error” is indistinguishable from end of file on most devices; check the block count.

NOTES

Portable applications should use cksum(1).

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

SunOS 5.9  Last Revised 7 Nov 1995

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPERANDS | USAGE | ENVIRONMENT VARIABLES | EXIT STATUS | ATTRIBUTES | SEE ALSO | DIAGNOSTICS | NOTES