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User Commands sum(1)
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 attri-
butes:
SunOS 5.10 Last change: 7 Nov 1995 1
User Commands sum(1)
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Availability | SUNWesu |
| CSI | enabled |
|_____________________________|_____________________________|
SEE ALSO
cksum(1), sum(1B), wc(1), attributes(5), environ(5), large-
file(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 check-
sums.
SunOS 5.10 Last change: 7 Nov 1995 2
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This page was generated on Wed Sep 12 21:37:08 GMT 2007
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