01-30-2007
I don't know what running "sum on software" means. I don't know what item is being compared to what other item. Are there even two items involved? Are you running sum on an item and later running sum again on the same item?
Because you are running sum on an empty directory, it is clear that you are actually using the directory as input. (As opposed to running sum on the contents of the directory.)
You say "Then our software is deleted, and reinstalled.". You do this because you're not happy with the sum on an empty directory?
A directory entry is a name and an inode number. A directory has many of these. A directory entry is deleted by clobbered the beginning of the name. Directories grow but do not shrink. Two empty directories may be of different sizes. And they may have differents shards of deleted entries laying around. Now put two identical entries in each directory. You may overlay the only differing shard. Or you may still have seemingly identical directories with differing sums.
Because of the tree structure of a file system, there is no legal way to create two identical directories although it can be done through trickery. So I still have no clue as to what you are doing.
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LEARN ABOUT OPENSOLARIS
sum
sum(1) 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 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 5.11 7 Nov 1995 sum(1)