Not sure if this has been posted here yet, but though it might be of interest. Turning your OSX box into a mailserver by replacing sendmail with Postfix. Very easy to follow guide and thorough explanations.
I tried everything I knew, or could find via Help, to get permission (booted in OS 10.0.3) to empty my trash, without success, including reinstalling OS X. I noticed something peculiar (after much trial and error): when first booting under 10.0.3, the Trash icon would show as empty, but as soon as it was clicked on, it appeared full.
Here's how I got things back to normal: while booted under X, I opened the trash (successfully), then double-clicked on the "Desktop (System 9)" folder and created a new folder. I then Selected All files in the OS X trash and dragged them to this new OS 9 folder.
The move was successful, and since then the OS X trash has behaved normally. The next time I booted under OS 9, I dragged the new folder (filled with OS X trash) to 9's Trash and successfully emptied it (using Option/Empty Trash, as some files were locked). I regained the appropriate amount of disk space, and the problem has not recurred as of this posting.
I don't know, but suspect, what happened: I think I must have put some files that originated under OS 9 into the OS X trash.
If you use the Address Book application, there are some pretty nifty things you can do with it. While reading this month's MacWorld (pick it up if you don't have it yet; they have some great OS X info in this edition!), they mentioned one tip I hadn't run into yet.
Open the address book, and click and hold on the little "person" icon next to any name. You'll see a mini business card appear, which can be dragged anywhere. Drag it onto the desktop, and a little "virtual business card" appears - simple double-click access for anyone's address. Drag it into a Cocoa application, and the field names and values for that card will be pasted as text. I'm sure there are more tricks, but those two are quite useful all by themselves. I haven't spent much time with the Address Book (keeping my fingers crossed for Palm!), but it's a handy little application.
Tip: How to easily keep your Powerbook from trying to connect to internet when on the road and off line.
Go to Network panel in System Prefs, Under the 'Locations' popup, select 'Edit Location'. Duplicate any existing location, and rename it something like 'Off-line'. Now go to the 'Configure' popup and select 'Advanced'. On this screen uncheck ALL of the connection types - and Save. Now you can switch easily at any time from the new 'Apple' menu's location sub-menu. When you select your new 'Off-line' location, your Powerbook will not keep trying to connect to internet.
I have a supported HP inkjet printer connected to my PowerBook via USB. The printer works great in OS X (especially with the new drivers), but I cannot print from classic. I am wondering if there is some majic set of extensions that need to be turned on or off to get something to print from Classic. It seems as if it the print job hangs in Print Monitor (Classic), and can not be passed on the Print Center (OS X). Has anyone figured this out yet?
After a lot of tryouts, I figured how to have the function keys F1, F2, etc., working (in Cocoa app only). In particular, I like to have F1 = undo, F2 = cut, F3 = copy, F4 = paste. As you will see I also have F9 = save (faster than Cmd-S) and F12 = check spelling.
If you're interested in defining your F-keys in Cocoa apps, read the rest of this article...
While looking for an easy way to access root UNIX directories in Finder, I have found following: Typing 'open /usr' in the terminal will open Finder window with the appropriate unix directory (in column view as a folder 'Private'). Also, typing 'open /private' will open a window with the root directories 'cores', 'Drivers', 'etc', 'tmp' and 'var'.
[Editor's note: You can also use the "Go -> Go to Folder" menu item and type the path to the folder to open a sub-folder; this doesn't seem to work (thanks sjonke!) for top-level folders.]
I had been getting really sick of my puck mouse when I downloaded Toon Boom Studio, and found it came with a Wacom tablet driver that isn't available, as far as I could tell, from Wacom. Be warned though. This driver proves that OS X isn't entirely crash proof, it can and probably will bring down the whole OS a couple times.
Reader 'brodie' sent this one in a couple of days ago, and I missed it in the queue...
If you have mail rules which conflict with one another (for example, anything that doesn't contain 'email@example.com' in the "To:" field gets moved to a "spam" folder, but you also want to move everything to 'firstname.lastname@example.org' into a "pending" folder), then all you need to do is drag the rules into the proper order within mail's rules panel. In this example, you'd drag the "doesn't contain my username" rule to the top, followed by the "move to pending folder" second. This way, your spam would get filtered first, and then remaining mail would get moved to the "pending" folder.
Rules are created and managed in the Mail -> Preferences menu item.
Some of the UNIX stuff in Mac OS X cannot be accessed easily trough the Finder (unless you want to type Pathnames all the time. However, there is a simple workaround using links (or aliases) to those folders and place them in Favorites or one of its subfolders.
This way you can more easily browse and edit system settings, while not being bothered by seing _all_ invisibly files all the time (as you can set it up in TinkerTool).
[Editor: To create the aliases in the Finder, use the Go -> Go to Folder menu item, and type the full path name. Once the folder opens in the finder, simply command-option drag it to the Favorites folder to create a reusable alias.]