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So I'm trying to change the plist to adjust the timemachine schedule, and when I try to change the number (of seconds, for the schedule), I get the response that I don't have permission. So I just changed the permissions for everybody to "read and write" but then when I go to save, i get the response "cannot save ....plist."

Any ideas?

Thanks -- Kyle

Mac OSX SL 10.6.6 MacBook Pro 6,2

EDIT: using the default mac plist editor

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how are you editing he file? – Mark Jan 27 '11 at 17:10
oh -- using the default mac plist-editor – kalaracey Jan 27 '11 at 18:32
up vote 2 down vote accepted

Instead of dealing with permissions, I'd go on terminal and

sudo nano /System/Library/LaunchDaemons/

Type your password, do your edits and Control-X + y

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Works as long as the plist in question is in XML format. Which this specific one is, fortunately. – Daniel Beck Jan 27 '11 at 21:17
For sure, but in fact it is :) – sidyll Jan 27 '11 at 21:20
this worked great. thx – kalaracey Jan 27 '11 at 23:18

Many programs replace files instead of just changing their contents. Property List Editor is one of them.

You need to temporarily give yourself permissions for the parent folder (/System/Library/LaunchDaemons/) to be able to remove and add files (which is what the program does) and you're good.

Afterwards, change the permissions of the new file to those of the original:

  • owned with r/w by system
  • read-only group wheel

Alternatively, edit the file in a text editor such as TextEdit or one of the "programmers'" text editors such as TextMate. It's easily readable XML, and they don't usually replace the file.

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