HOW To Remove Dock Spacers Via Termianl Command

One of the Mac websites offered a way to add spacers to your dock through a command line statement like this:
defaults write com.apple.dock persistent-apps -array-add '{tile-data={}; tile-type="spacer-tile";}'
Now this worked beautifully on my Mac Pro and I was able to add two spacers to the application side of the dock. On the Mac Pro I can easily drag these spacers to a new position or drag them upward and off (deleting them).
I have a new MacBook and it should work the same, right? The spacers were created but I can't move them nor drag them off the dock.
In another post someone suggested deleting or removing your Dock's preferences (which will reset it to the defaults). This file is located at /Users/"Your username"/Library/Preferences/com.apple.Dock.plist.
But there is NO com.appleDock.plist although there is a comp.apple.dockfixup.plist although I am apprehensive to delete it.
Does anyone know how to remove a spacer using the Terminal's command line? I can't think of any other way to remove these spacers on the MacBook.

Ok. I found an answer. The removal of the comp.apple.Dock.plist did return my dock to its original setup. I was not looking in the "Users" directory. I moved it off to my desktop and restarted the MacBook. It came up with the default dock. I'll have to bring back my apps but other then that, it worked.
Sorry for wasting your time but maybe this answer will help someone in the future.
Lisa

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Sooo... For the sake of organisation I added in these "Dock spacers" via messing around with terminal and inserting the command "
defaults write com.apple.dock persistent-apps -array-add '{tile-data={}; tile-type="spacer-tile";}' " and then " killall Dock "
The thing is, I want to rmy computer, and to do so I want to reorganize my dock. I want to remove all of the Dock spaces I have right now and add new ones later after I finished remodeling everything else (folders, aliases, etc.)
My problem is that I can't remove the dock spacers. I'm unable to select them and remove them from the dock like instructed on every other Dock Space related webpage, this includes moving them around (they're practically empty spaces that can't be altered). Any hints on how to fix this?
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By using "spacers" I can display my Dock apps in groups - systems apps like iTunes, Mail, App Store, Dashboard, Finder, Launchpad as one group then a space and the next group: EyeTV, Media Editors, Toast, Apperture, Final Cut Pro, and others followed by another spacer and another group for TextMate, Pages, FireFox, Safari, SeaMonkey, etc.
Apple should give the user the option of many screen features including the ability to remove the shelf.
BTW - here's how you add spacers to your Dock as well as a Recent Applications Stack or Grid:
Add Spacers to the Dock
If you want to divide the applications in your Dock into groups, the best way is to add spacers. A common method is to create "fake" applications with an invisible icon to fill the space, but that is a bit inelegant. A much better way, available in Leopard, is to use a Terminal Command. Each time you run the command it inserts a blank "space" into your Dock, which you can then drag around to where you like.
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defaults write com.apple.dock persistent-apps -array-add '{tile-data={}; tile-type="spacer-tile";}'
For the changes to take effect you will have to restart the Dock, either by logging out and in again or by running the killall Dock command in the Terminal. The spacer appears at the end of the icons that are permanently in the Dock. You can then drag it along to where you want it.
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The above command inserts the spacer on the applications side of the Dock. To insert a spacer on the right hand side, use the following command:
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You can add a Recent Applications stack to the Dock. To do so, open Terminal and type this command:
defaults write com.apple.dock persistent-others -array-add '{ "tile-data" = { "list-type" = 1; }; "tile-type" = "recents-tile"; }'
After that, type killall Dock in the Terminal to restart the Dock and see your new folder. This is a great little Dock icon for using an app you used recently but is not generally held in your Dock.
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