Consultant

Alan

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Hi Arnold,<br><br>It seems I had misunderstood how it worked with the zip files.<br><br>I thought I would be saving time in only changing the files that had actually changed (akin to how rsync will skip over files that are the same, but add, update, and delete as required, subject to the options you choose).<br><br>By the sounds of it, if I stick with zip archives, I might as well re-create the entire zip file each time?<br><br>Is there any other (standard - built in to most Linux distros, and in particular, Ubuntu) archive format that can do only the adds, updates, and deletes, that you know of?<br><br>Thanks,<br><br>Alan.
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If memory serves, an archive is recreated from scratch <br />
Commonly, Linux, UNIX systems use tar to combine files into an archive that then gets compressed.<br />
Gzip .gz and bzip2 .bz2 are the commn compressors.<br />
shorthand tgz is a tar archive compressed by gzip built-in feature of tar (-z option)
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Can any of those do what I had hoped to do with zip archives?
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While tar includes an add option, it is still not the small operation you want.<br />
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The distinction between archive and rsync deals with an ability to compare <br />
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The only way to compare an item within an archive is to unpack the archive.
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Yeah - same as for zip files.<br><br>I guess i just have them re-created from scratch each time. &nbsp;Not the end of the world - its all scripted anyway.<br><br>Thanks for your help,<br><br>Alan.
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One option you could do is differential data exchange, only compress the items that have recently changed and include the list of files with md5sum ..<br />
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This way when the new zip is receives the inventory list can be used to remove files that should no longer be there..
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Good idea, but I'm going to keep it simple and just zip from scratch.<br><br>Time is not really an issue, and I generally prefer to avoid complexity unless there is a good reason / payback.<br><br>If it had been just a switch I was missing or mis-using, then great, but I'll stick with the 'brute force' approach I think 🤔<br><br>Alan.
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Thanks Noci - I've gone with just recreating the zip each time, but I'll look into cpio.<br />
<br />
Alan.
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Hi All,<br><br>I am trying to get 'zip' to update all changes without having to re-build (re-compress) all the files that have not changed.<br><br>I am running this on Ubuntu Server 18.04 LTS, but I doubt that changes anything.<br><br>The base command I am using is:<br><br><pre><code class="code-1 nolinks" id="code-10-29215820-1"><span>zip -r9 /mnt/Path/Backups/Drive1.zip /media/Drive1/Files/</span>
</code></pre>This works fine and zips up all the files into Drive1.zip.<br><br>However, when I run this next time, I would like it to not have to re-compress all the files, but rather just add new files, update any files that have changed, and delete files that no longer exist.<br><br>So I tried this:<br><br><pre><code class="code-1 nolinks" id="code-10-29215820-2"><span>zip -f -u -r9 /mnt/Backups/Drive1.zip /media/Drive1/Files/</span>
</code></pre>However, it does not seem to actually delete files that no longer exist, and the zip archive just grows slowly but surely over time.<br><br>What am I missing?<br><br>I could just delete the previous Drive1.zip and re-create each time, but that will be much slower I think.<br><br><br>Thanks,<br><br>Alan.
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Hi All,
I am trying to get 'zip' to update all changes without having to re-build (re-compress) all the files that have not changed.
I am running this on Ubuntu Server 18.04 LTS, but I doubt that changes anything.
The base command I am using is:
zip -r9 /mnt/Path/Backups/Drive1.zip /media/Drive1/Files/
This works fine and zips up all the files into Drive1.zip.
However, when I run this next time, I would like it to not have to re-compress all the files, but rather just add new files, update any files that have changed, and delete files that no longer exist.
So I tried this:
zip -f -u -r9 /mnt/Backups/Drive1.zip /media/Drive1/Files/
However, it does not seem to actually delete files that no longer exist, and the zip archive just grows slowly but surely over time.
What am I missing?
I could just delete the previous Drive1.zip and re-create each time, but that will be much slower I think.
Thanks,
Alan.

Linux - Zip - How to update all changes without re-building entirely

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