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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 ( 2^31 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

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.

Index

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

OPERANDS

USAGE

ENVIRONMENT VARIABLES

EXIT STATUS

ATTRIBUTES

SEE ALSO

DIAGNOSTICS

NOTES

Партнёры:

Хостинг: