sum - print checksum and block count for a file
sum [-r] [file...]
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.
The following options are supported:
-r Use an alternate (machine-dependent) algorithm in com-
puting the checksum.
The following operands are supported:
file A path name of a file. If no files are named, the
standard input is used.
See largefile(5) for the description of the behavior of sum
when encountering files greater than or equal to 2 Gbyte ( 2
See environ(5) for descriptions of the following environment
variables that affect the execution of sum: LC_CTYPE,
LC_MESSAGES, and NLSPATH.
The following exit values are returned.
0 Successful completion.
>0 An error occurred.
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Availability | SUNWesu |
| CSI | enabled |
cksum(1), sum(1B), wc(1), attributes(5), environ(5), large-
"Read error" is indistinguishable from end of file on most
devices; check the block count.
Portable applications should use cksum(1).
sum and usr/ucb/sum (see sum(1B)) return different check-
Man(1) output converted with