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10.5: How to assign X11 to a Space System 10.5
If you want to assign X11 to a Space, go to the Spaces System Preferences panel, and choose to add an application (click the plus sign). Instead of choosing X11.app from the Utilities folder, press Shift-Command-G to bring up the Go to Folder text entry box. Type /usr, and click Go, then choose X11 » X11.app. Assign it to the Space you wish, and you're done.
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10.5: Create a Time Machine size limit for networked disks System 10.5
I am using Time Machine to back up my MacBook Pro on a Samba drive connected to a Linux machine, per this hint. The thing is that when you use Time Machine, it will fill up your disk with backups. However, since I am using a shared networked drive, I wanted to leave free disk space for other users and keep my sysadmin happy. So, here is how you can prevent Time Machine from filling up your networked disk.

First, when you use Time Machine with a SMB disk, it creates a .sparsebundle disk image to put the backup data into. The disk image has a capacity of 2.75 TB. Since my SMB disk has only 1.5 TB of capacity, the disk image shows that 1.25TB is used and 1.5TB is available. The trick is to create another sparsebundle disk image of a given capacity (I used 300GB) on the SMB disk. Use 'Mac OS Extended (Case-sensitive, Journaled)' as the volume format in Disk Utility. Name the volume the same as the volume used by Time Machine (it should be Backup of computerName), and save it to something like test.sparsebundle.

Then, turn off Time Machine, mount your Time Machine backup image (by opening the .sparsebundle disk image on your SMB disk) and your newly-created disk image and use Disk Utility to 'restore' the Time Machine disk image into your new image. Click on the 'Erase Destination' button in order to allow Disk Utility to make a block copy of your Time Machine disk image. Wait for the process to finish.

Once finished, unmount both images and open a Finder window into your SMB drive. Note the name of the disk image used by Time Machine; it should be computerName_ABC123DEF.sparsebundle, where ABC123DEF is your MAC address. Delete this image, and rename your test.sparsebundle to this name. Then, restart Time Machine. The next time it backs up, you will see that the backup disk image used by Time Machine now has a new capacity (300GB in my case), and Time Machine will not fill up your network disk. It will use no more than 300GB.
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10.5: Switch Spaces with just the mouse System 10.5
Apple has given us several easy ways to switch spaces in Leopard. I'm using an even easier method that only requires my mouse.

I hardly ever use the horizontal scroll feature of my mouse -- left-and-right scrolling doesn't come up often enough for me to really need it. So I've mapped left scrolling the mouse wheel to the keystroke Control-Left Arrow, and right scrolling the mouse wheel to the Control-Right Arrow. Now just a quick left or right flick of my mouse wheel switches me between my spaces.

If you don't have a mouse with horizontal scrolling, you could program the scroll wheel button to F8 to bring up the Spaces view and then just mouse to the space you need. Either way gives you a easy method that doesn't require moving your hand off the mouse.
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10.5: Enable two-finger clicking on some PowerBooks System 10.5
With Leopard, Apple has given PowerBook users the ability to secondary (right) click with two fingers on the track pad! In Tiger, this was only possible on MacBook/MacBook Pros.

In the Keyboard & Mouse System Preferences panel, go to Trackpad and enable "Tap trackpad using two fingers for secondary click." Thank you Apple for adding this functionality which previously was only available by buying new hardware! I have only tested this on a G4 Powerbook 15" 1.67Ghz -- I don't know if it appears when loading Leopard on other PowerBooks.
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10.5: A fix for hidden Unix files showing in file system root System 10.5
Have you just reinstalled Mac OS X Leopard? Are you one of the unlucky ones that now has visible Unix files in your root file system? I sure did, and after digging around a little, it seems to be a bug in the Mac OS X installer -- but it only happens when you install a clean copy of Leopard (not updating). The question however, is how to get rid of them.. Obviously, deleting the folders is NOT an option.

Here's how you hide them:
  1. Insert your Leopard DVD
  2. Choose Open Apple Install Discs in Pacifist
  3. Choose the Leopard DVD
  4. Find and Extract the following two files to a directory of your choice:
    • Resources » OSInstall.mpkg » OSInstall.pkg » Scripts for hidden_MacOS9
    • Resources » OSInstall.mpkg » OSInstall.pkg » Scripts » Tools » SetHidden
  5. Open Terminal and cd to the folder you extracted the files to.
  6. Run this command sudo ./SetHidden / hidden_MacOS9.
  7. Enter password and reboot your Mac once the command has executed.
After rebooting, the unix folders and links should now be hidden from the root file system again, just like in Tiger.

[robg adds: I did a clean install on one of my machines, and didn't see this bug. However, I have seen it reported elsewhere, so here's one possible fix.]
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10.5: Place an icon on an NTFS drive in Leopard System 10.5
This process was covered for Tiger in this hint, but things have changed in Leopard; it's now a bit easier:
  • Paste your icon (in the Get Info window) onto a USB thumb drive formatted as FAT32. The name of the drive doesn't matter.
  • Launch Windows through Boot Camp, Parallels Desktop, or VMware Fusion.
  • Open the thumb drive in Windows.
  • Select Folder Options… from the Tools menu, and set it to show invisible files.
  • Copy the two files .VolumeIcon.icns and ._[cr]File, where [cr] is a carriage return, to the NTFS drive.
That's it! The icon will appear nicely in Leopard.
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10.5: Create your own iTunes visualizers and more System 10.5
Under Tiger there was a clever third-party iTunes plug-in called iVisualize which allowed you to make your own iTunes visualisers using Quartz Composer. Under Leopard, it's not even needed any more -- simply make a new Music Visualiser type composition in Quartz Composer, and drop it into the Compositions folder of your library.

You can also make your own iChat Video Effects by the same route -- just choose Image Filter as the composition type. Similarly, the Image Transition composition type can be used for Keynote transitions. For more info, see the Quartz Composer release notes. If you've got the Developer Tools installed, you can also examine the examples at /Developer/Examples/Quartz Composer.
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10.5: Update Boot Camp drivers in Windows System 10.5
If you installed the Boot Camp beta under Tiger and have now installed Leopard, you should update the Windows drivers.

You will need to reboot into Windows, insert the Leopard DVD, and then let the installer update the drivers to the current versions. Leopard installation on your OS X partition does not update the Windows' drivers.
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10.5: Fix a potential cause of Core Image crashes System 10.5
After upgrading to 10.5, I discovered that a whole bunch of stuff involving Quartz CoreImage and Composer was broken. As an example, here's some, but not all, of what I saw:
  • iChat crashing when it did anything with video
  • Photo Booth refusing to show effects samples
  • QuartzComposer crash on launch
  • CoreImage Fun House would only allow a few filters to be used
You might get console messages like this:
11/5/07 2:32:55 PM Quartz Composer Visualizer[227] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[FILTER_NAME_HERE load:]: unrecognized selector sent to instance 0x15195000'
Well apparently the interface to ImageUnits has changed in some way, because it turns out that the problem was that I had a bad ImageUnit plug-in in /Library/Graphics/Image Units, installed from before (it worked in Tiger).

So, if you have any of the above symptoms, you may want to try removing anything suspicious from that directory. Note that the name from the error message is not necessarily the same name as the file. I'm a little surprised that Apple has not systematically wrapped the loaders for such plug-ins with exception handlers, so at least bad ones do not cause crashes.
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10.5: Use Witch to switch between apps in a single Space System 10.5
Using Witch, you can swap between only the applications that are active in the current Space.

In the Witch preference pane, go to the Behaviour tab and make sure that 'Show an "Activate" item for windowless/hidden applications' is disabled. Now when tabbing through windows in Witch, only the applications in the current Space will be available.
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