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Special Forums Hardware Filesystems, Disks and Memory Directory is Same but Checksum is different Post 302105031 by Perderabo on Tuesday 30th of January 2007 09:54:59 AM
Old 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. Smilie
 

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RMDIR(1)						    BSD General Commands Manual 						  RMDIR(1)

NAME
rmdir -- remove directories SYNOPSIS
rmdir [-pv] directory ... DESCRIPTION
The rmdir utility removes the directory entry specified by each directory argument, provided it is empty. Arguments are processed in the order given. In order to remove both a parent directory and a subdirectory of that parent, the subdirectory must be specified first so the parent directory is empty when rmdir tries to remove it. The following option is available: -p Each directory argument is treated as a pathname of which all components will be removed, if they are empty, starting with the last most component. (See rm(1) for fully non-discriminant recursive removal.) -v Be verbose, listing each directory as it is removed. EXIT STATUS
The rmdir utility exits with one of the following values: 0 Each directory entry specified by a directory operand referred to an empty directory and was removed successfully. >0 An error occurred. EXAMPLES
Remove the directory foobar, if it is empty: $ rmdir foobar Remove all directories up to and including cow, stopping at the first non-empty directory (if any): $ rmdir -p cow/horse/monkey SEE ALSO
rm(1) STANDARDS
The rmdir utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. HISTORY
A rmdir command appeared in Version 1 AT&T UNIX. BSD
March 15, 2013 BSD
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