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Re: Perl's pearls

by stefp (Vicar)
on Jan 02, 2002 at 00:10 UTC ( #135541=note: print w/replies, xml ) Need Help??

in reply to Perl's pearls

Unique signatures can be put to all sort of good use. Suppose you want to regularly do a complete backup a farm of workstations. If they run the same OS, these workstations have a lot of files with identical content.

So when you do a backup, you compare the MD5 signature of each file to see if it match signature of the files already stored.

For each workstation, you also need to save the path of each file and all the meta information (ACLs, major-minor for devices...). Files in the same directory when sorted alphabetically share a "prefix string" so you can store only what changes from one file to the next; example:

/var/log/meesages /var/log/messages.1 # add .1 /var/log/meesages.2 # replace "1" by "2"

But you are lazy and know this have been done before anc check out the source of slocate/updatedb. :)

I delibaretely have overlooked many details. I just wanted to give an example where unique signatures could be used.

-- stefp

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[Corion]: Meh... Github (understandably) doesn't allow files larger than 100MB, but my rebase of an older repo (from Github) includes such a file and now I can't push my changes there
[Corion]: Maybe that is the push I need to finally try out Gitprep ;)
[Corion]: On the upside, I should finally improve Image::CCV to also do ImageNet classification using their pretrained parameters
[Lady_Aleena]: Hello Corion.
[Corion]: Hi Lady_Aleena!
[Lady_Aleena]: Corion, how are things?
[Corion]: Lady_Aleena: Quite good ;) I'm working four days now, instead of five, which helps my mood and my weekends tremendously
[Corion]: My Perl output hasn't recovered, but as $work is still somewhat stressful, I don't think this would be different with a five day workdweek
[Lady_Aleena]: Corion, that is a good thing (TM) 8)
[Corion]: And this evening, I'm actually dusting off some old module of mine and bringing it up to the last version of the library I'm wrapping

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