What happens if I DON'T repair permissions before installing 10.5.2?

What can happen to the installation if permissions aren't repaired? Would the installer quit/freeze? Thanks.

...nothing.
99% of the time, repairing permissions fixes NOTHING.
In fact, repair permissions is mis-named. It does not REPAIR anything. What it does is RESET permissions on the system to the same as the BOM files (bill of materials) files say they had when the OS was installed. If those permissions in the BOM files are wrong, or if they are different to what you as a user WANT them to be (say, you're experienced and know what they're doing), the permissions will be RESET to what the BOM files say.
So "can't hurt, can only help" is IMO bad advice.

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What happens if I don't approve Update to CRM 2015 Online

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Can anyone help me with this simple question?
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What happens if I don't update ios 7?

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Repairing permissions before and after updating software

What is the reason to repair permissions before and after updating software? This may sound like a stupid question to many of you, but I am new to computers and I am trying to learn how and why of some of the things of my PowerBook. I installed some updates without repairing permissions. Did I install some software updates the wrong way? Thank you.

This is a topic which will draw as many emphatic for and against responses as overnight shut down or not, defrag or not, optimise or not, and so on.
I agree with Neil. I believe that OS X has progressed sufficiently that repair permissions has become redundant and so I do not do it on any regular basis.
Some folk may refer you to an Apple Support Article 303602. That Article in its 4 May 2006 version, titled "Top 10 Tips to Keep Your Mac in Top Form" suggested Repair Permissions should be done "after upgrading or installing new software". The Article was however revised on 15 May 2006 to be titled "Top Tips to Keep Your Mac in Top Form" and the item on Repair Permissions [along with two other recommended maintenance tips] was removed. It is my view that the conclusion to be drawn here is that Apple no longer considers Repair Permissions to be a required maintenance procedure.
Many users have adopted a "Repair Permissions" mantra for a cure-all over several years. I dropped it sometime in 10.3.
But, to each his own.
HTH
TiPB 867 Mac OS X (10.4.6)

Should I repair permissions before or after updating to Mac OS X 10.7.2?

Hi,
Should I repair permissions before or after updating to Mac OS X 10.7.2? or should I fix permissions before and after the update?

This is not a routine maintenance. Upgrades can be screwed up if the system that is upgraded is screwed up. I believe in a "better safe than sorry" approach. If you repair permissions and the hard drive prior to an upgrade then if there be a problem perhaps that problem will not propagate to the new upgraded system. If there are no problems doing the repairs is harmless.
When it comes to the topic of permissions repairs there are many opinions but not much fact. In other words there doesn't appear to be a formal analysis of whether repairing permissions is only useful when a permissions problem arises. But there is a lot of anecdotal evidence suggesting that a repair both before and after a major system upgrade can reduce the risk of problems.
This is my opinion on the matter. I do not generally disagree with Niel or MacJack, but as I said I prefer to be safe rather than sorry.
Here's my general approach:
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A. Repair the Hard Drive and Permissions:
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. Then select Disk Utility from the Utilities. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now restart normally.
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Select the destination volume from the left side list.
Click on the Restore tab in the DU main window.
Check the box labeled Erase destination.
Select the destination volume from the left side list and drag it to the Destination entry field.
Select the source volume from the left side list and drag it to the Source entry field.
Double-check you got it right, then click on the Restore button.
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If you have a FireWire hard drive connected, disconnect it before installing the update unless you will boot from this drive and install the update on it. Reconnect it and turn it back on after installation is complete and you've restarted.
You may experience unexpected results if you have installed third-party system software modifications, or if you have modified the operating system through other means. (This does not apply to normal application software installation.)
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Purchase the Lion Installer from the Mac App Store. The download will start quickly. Lion is nearly 4 GBs so a fast internet connection is essential. Download time could run upwards of 4 hours depending upon network conditions and server demands at the time.
Boot From The Lion Installer which is located in your Applications folder.
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What is the correct procedure for repairing permissions

I am getting ready to upgrade to Tiger from Panther. I have used the disk utility to repair permissions after an upgrade or hardware addition. I have always done it using the disk utility and not from a boot up on the OS install dvd.
Is there a difference? I notice that if I do a repair permissions 2 or 3 times in a row that some of the same permissions are repaired again and again.
Thanks for any info!
Ymir

I notice that if I do a repair permissions 2 or 3 times in a row that some of the same permissions are repaired again and again.
I assume you are referring to the log entries which contain "We are using special permissions..."
If so, you can safely ignore those messages. They are purely informational. This is not indicative of a permissions problem.
There is also no need to repair permissions while booted from the system DVD. Running it the way you are is fine, and you should only need to do it when you have a problem with your machine resulting from improperly set permissions.

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What happens if I don't upgrade MyBT i.d. in the 1...

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You are not alone with what you want to do. The customer/user migration process starts when you try to log onto your email via the webrowser log on https://signin1.bt.com/login/emailloginform
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I would imagine that there may also be something such as being locked out of your email account after the 12 days until you complete the process.
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What disk and when do I repair permissions?

Hi I'm wondering how and when to "repair permissions" - Do I select the icon in disk utility marked 111.8 GB Samsung HM120JC or the icon beneath it marked and named as my hard drive? Does it matter? And how often/when should I do this?
Thanks much
KB

Hi, Kent. It doesn't really matter whether you select the hard drive mechanism (the top line that you've named in your post) or the volume that appears as the startup drive on your desktop — either way, the permissions on that volume will be repaired. If your hard drive is partitioned into two or more volumes, and you select the drive mechanism, permissions will be repaired on each volume that contains an OS X installation. (Permissions can only be repaired on a volume that contains OS X; a partition that doesn't have OS X installed on it can't have its permissions repaired.)
You should always repair permissions after any software update, upgrade or installation that involves Apple's Installer application (Installer.app). Most knowledgeable folks here also recommend doing so before every such installation, upgrade or update, to prevent a damaged or corrupt permission from interfering with the Installer's business and thereby fouling up whatever's being installed.
Repairing permissions is not a cure-all, and though some people consider it a routine maintenance practice, others emphatically don't. I think of it as a totally harmless, free, quick, easy procedure that sometimes solves minor problems, and I probably do it more often than is really productive: every two or three weeks, even if I haven't installed anything lately or had any problems. But I always do it before and after every Apple software installation, even ones that are installed through the Software Update utility — and that means I never allow SU to install more than one thing at a time, specifically so I can repair permissions between installations.

Repairing Permissions (pre-install)

Could somebody clarify something for me. From information elsewhere on here, I have an upgrade procedure which includes using Disc Utility for disc repair - I understand why this cannot be the copy of DU on my internal drive so needs to be from the copy on the install DVD, but it's also recommended that you repair permissions. Is this also from DU on the DVD or should that be from DU on the internal drive?

"Is this also from DU on the DVD or should that be from DU on the internal drive?"
Ordinarily I don't believe you would have to worry about using the DVD for repairing permissions. Since you will already have the DVD up and running the DU for Disk Repair, you might as well go ahead and do it that way.
I believe DU tells you which way to go once you're inside the utility .. on the top portion of it. You can just load it up and see what it says. It is not going to hurt anything, it won't require you to run anything, and you can back right out of it. So load it up and see what it tells you.

What happens if I DON'T repair permissions before installing 10.5.2?

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