[TriLUG] md5sum question

[William Sutton]

if you find . -exec md5sum >myfile.md5, then myfile.md5 will be a text 
file listing all of the md5sums (one after another) for all of the files 
in that directory, right down to the bottom of the tree.

William Sutton

On Thu, 6 Nov 2008, Jason Watts wrote:

> For replicating files  (trying to check the integrity is just a small
> portion of what I am trying to get done)  I am planning on using rsync.  I
> have noticed at work, that rsync on a gig network with a nice 4 disk raid on
> one, and 10 disk on the other, it is quicker than scp.  (not using any of
> the restart features due to the directory being recreated every night).
>
> For integrity... on my personal stuff, I can use any number of things... i
> am completely up for anything there.
>
> Another question, If I use  the find -exec md5sum | sort | md5sum only mod
> it to find -exec md5sum > myfile.md5
>
> wont I have what I am looking for?  a hash of all the files individually
> within that upper level directory?  and would my version only be one way?
> can I use md5 to read the myfile.md5?  or would I have to generate two md5's
> and run a dif?  (let me know if this confuses anyone... I am thinking in
> text  as well as fishing for answers)
> Thanks, the help here is quite appreciated.
>
> Jason
> On Thu, Nov 6, 2008 at 6:27 PM, Kevin Hunter <hunteke at earlham.edu> wrote:
>
>> At 6:19pm -0500 Thu, 06 Nov 2008, Kevin Hunter wrote:
>>> Downthread you say it's 3 inches above your head, so let me attempt an
>>> explanation:
>>
>>> [ explanation snipped ]
>>
>> That all said, I second Alan Porter's suggestion that you learn about
>> rsync.
>> I find it a very handy utility when transferring large files, especially
>> over
>> a slow/inconsistent network, but also between slow and older disks.  It can
>> transfer files in pieces, and only if those pieces have changed.  This
>> enables
>>
>> * restart of broken upload/downloads
>> * very quick synchronization of minimally changed files.  (e.g. daily
>> updates
>>  to an iso or virtual machine image)
>> * minimal bandwidth usage
>>
>> Tell us what you go with, eh?
>>
>> Kevin
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