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SSH 'version mismatch' error and fix in 10.1 UNIX
If you installed your own version of SSH (particulary using instructions from Stepwise) under 10.0.4, you may get an error such as this

OpenSSL version mismatch. Built against 90581f, you have 90602f

when you try to use SSH in 10.1. Stepwise has the solution in the form of a "SSHCleanup.command" shell script; click here to view the script's contents. To use it, copy and paste the text into a new text file and name it "ssh-cleanup.command". Save the file (in pure text format), then open a terminal and type sudo sh ssh-cleanup.command in the directory where you saved the file.

This should fix your SSH problems in 10.1. Thanks to Peter H. for finding both the error and the solution.
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Browse the web tab-style with Mozilla! Web Browsers
The latest builds of Mozilla have enabled a very cool feature - tabbed web site browsing. The concept is quite similar to Excel, wherein multiple worksheets are displayed in one workspace, and are chosen for display by clicking on a tab at the bottom of the window. Mozilla now offers that very same feature for browsing the web. It's an excellent idea, especially for those on smaller screens where windows can quickly proliferate and get lost. Now you can do all your browsing in one main window.

To create a tab, simply hit control-T (not command-T!). Once created, click on a tab to activate it. Switching among the tabbed pages is nearly instantaneous. You can even switch tabs while loading a page in one tab; Mozilla treats each tab as an independent window, so that multiple tabs can all be loading simultaneously. To delete a tab, simply close the window it's displaying (using the "X" at the right edge of the row of tabs).

This functionality in Mozilla is a small subset of a third-party product called MultiZilla, which has many additional features. It should be possible to get this running on Mozilla on OS X, but I haven't tried as of yet. To try out tabbed browsing, you'll need to get the latest nightly build for OS X, as tabs are not in the latest milestone (0.94) release.
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Web sharing and mod_hfs in 10.1 UNIX
Some users have reported problems when they try to enable Web Sharing (which launches the Apache web server) in OS X 10.1. The issue is apparently related to the "mod_hfs_apple" file, which Apple created to work around an HFS-related security hole.

You can either disable mod_hfs until Apple fixes this (not recommended due to the security issues) or patch it, thanks to Stepwise. The disabling instructions are in the remainder of this article. To patch it, simply do the following in a terminal session:
cd /tmp
curl -O http://graphics.stepwise.com/patches/mod_hfs_apple.tgz
sudo tar -xzf mod_hfs_apple.tgz -C /
Make sure you stop Apache and restart it after the change. These commands install the new mod_hfs module from the Developer Tools, which are not yet publicly released.
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Installing 'wget' on 10.1 UNIX
Apple has removed 'wget' from OS X 10.1, apparently due to GPL (the Gnu Public License) issues. This is a most handy command, as it can download files and web pages from the command line over an SSH connection. I use it regularly to start large downloads at home while I'm at work.

To replace 'wget', you can download it from one of the GNU software mirror sites (it's in the 'wget' directory) and compile it yourself (this will require the Developer Tools to be installed). Once you've downloaded and expanded the archive, simply "cd" to that directory and type "sudo make install" to install the new 'wget'.

Once I've received my Dev Tools CD, I'll make a pre-compiled version available on my mac.com home page.
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S-video and Mac OS X 10.1 upgrade Install
Upon trying to run the 10.1 upgrade CD, I found that after following through the appropriate steps (giving it the administrative password, letting it restart and seek through the CD many times while on a grey screen) the screen eventually went to blue, and just stayed there. After the initial panic, it turns out the installation screen was being sent to the TV over the S-video cable I had left connected. Why it chose to place this screen on this secondary monitor is confusing.

To avoid this problem, make sure the S-video cable is disconnected during your Mac OS X 10.1 upgrade.

On a related note, the new 10.1 has a screen saver -- which for me only appears also on the TV if the S-video connector is attached. In configuring the dual monitor, I have made sure the menu bar is at the top of the 'primary' monitor, and that the monitors are not mirrored. If I select a background image, for example, it only appears on the 'primary' screen. My desktop and dock are on the 'primary' monitor. Yet my mouse seems to start in the TV screen when S-video is attached.

How does one move the screen saver to the 'primary monitor', and set backgrounds for the 'secondary monitor', since there are no setting for monitors in either of these control panels?
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Scroll arrows at both ends of scroll bars [10.1] System
OS 10.1 adds an option in the General prefs to have double-scroll arrows at the bottom of the scroll bar. Scott R. wrote in with a quick preferences hack to enable double-scroll arrows at BOTH ends of the scroll bars. If you'd like to enable this feature, simply start a terminal session and type:
defaults write "Apple Global Domain" AppleScrollBarVariant DoubleBoth
You then need to logout and login (or, perhaps, simply force quit the Finder) to see the effect ... but once you've done so, you should have double-scroll arrows at both ends of your scroll bars.

I'm not sure which combination of applications (Cocoa, Carbon, Java) this applies to, but it works for certain in the Finder and a couple of Carbon applications I quickly tested. To return to the normal mode, use:
defaults write "Apple Global Domain" AppleScrollBarVariant Single
(or you could just open the General pane in the System Prefs and check "At top and bottom") or
defaults write "Apple Global Domain" AppleScrollBarVariant DoubleMax
to put them together only at the bottom (again, this is equivalent to clicking "Together" in the General prefs panel for scroll arrows).
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Running Applets safely Internet
If you have to run an applet, and it crashes your browser (as most applets seem to do), you can sometimes work around it with the 'appletviewer' command.

Open up the Terminal. The appletviewer command takes the URL as an argumnet. For example:

appletviewer http://www.killradio.org/chat.html

...will run the killradio.org chatroom, which didn't run in my browsers. It runs in it's own small window, which is nice.

[Editor: This situation should be greatly improved in 10.1, as the Java support in browsers has been greatly improved.]
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Easy screen captures [10.1] System
Use shift-command-3 (entire screen) and shift-command-4 (region) to take screenshots in OS X 10.1. The images are dropped on your desktop, saved in TIFF format, and they'll open in Preview when double-clicked.

SnapzProX offers more features for file formats, movie captures, and menu captures if you need those capabilities (and I do and I love the program ;-) -- but it's great to see the return of the easy-to-use built-in commands from Apple.
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Where to find mail.app attachments Apps
I was curious if anyone knows where the OS X Mail App keeps attachments/documents that you are working on when you open them from a mail message? I was working on a Word doc and saved consistently, but soon realized that it was just saving the open Word document to some ether land and not to an actual apparent location.. Is there any way to recover this document?

Thanks
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Rearrange your menubar icons [10.1] Desktop
In OS X 10.1, there are a number of menubar widgets, including some or all of a clock, Airport indicator, sound control, monitor control, and battery life indicator. If you hold down the command key and drag on any of these widgets, you can place them in any order you wish on the right-hand side of the menubar.

For example, you may wish to put the monitor or sound widget in the corner, in order to make it easier to hit with the mouse on the fly.

Click here to see a brief movie, courtesy of Andrew Welch at Ambrosia.
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