Sometimes you simple need all your drives on your desktop, but the ones like ‘TimeMachine’ or ‘Lion Installer’ can also simple disappear. Use this script to hide them at every reboot, without having to unmount them. Adjust your volume name to reflect yours.

sudo echo "echo \"UUID=$(diskutil info /Volumes/Lion\ Installer/ | grep UUID | awk '{print $3}') none hfs rw,noauto\" >> /etc/fstab" | sudo bash

To see if it has worked:
sudo cat /etc/fstab

Results in:
UUID=F4F6562F-1C4D-361D-BBD4-91C12ED96B44 none hfs rw,noauto

If your /etc/fstab doesn’t show the UUIC, then you need to check the volume name and/or delimit spaces with an \.

The newer versions of Preview (at least OS X 10.5, and maybe earlier) respect the “do not print without a password” setting in PDF files. However, it is possible to create a completely unprotected version of any PDF file using ghostscript. A command like this should work:

gs -sOutputFile=MyNewFile.pdf -sDEVICE=pdfwrite -dNOPAUSE -dbatch -q MyProtectedFile.pdf

You may need to type “quit” at the command prompt after gs finishes processing the file. Then open the newly created PDF file and voilà, printable!

Here’s a quick write-up describing how to connect to your Mac at home from your Mac at work (or any other Mac…).

Prerequisites

1) User access with administrator’s rights on your remote OS X computer.

2) An Secure Shell (SSH) client on your local computer. On Windows, Puttyis a common and free version. Linux and MAC OS X, by default, come with SSH.

3) A VNC viewer client on your local computer.  In our case, we’ll using Screen Sharing. You won’t find it in the finder; it’s hidden here:

/System/Library/CoreServices/Screen\ Sharing.app

4) Network access to the SSH service on your remote machine.  This requires

a)  You know your remote machine’s hostname or IP address.
b)  Being behind the firewall, having VPN access, or being accessible to the public Internet (i.e. no firewall).

How to Remotely Turn On (and off) OS X Screen Sharing

This procedure keeps security in mind.  The idea is to turn on screen sharing while you need it, and then turn it off when you’re done.

1)  SSH into your remote OS X machine with an administrator’s log in and password.

2) Enable Remote Desktop (a.k.a. Screen Sharing, a.k.a. VNC) with this command:

sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart -activate -configure -access -on -clientopts -setvnclegacy -vnclegacy yes -clientopts -setvncpw -vncpw password -restart -agent -privs -all

3) Login using a VNC client. You can use Screen Sharing or Chicken of the VNC (see tip below).
Your password is “password” (see the -vncpw flag in the above command;  you can — and should — change this).

4) When you are done, turn of screen sharing using your SSH session:

sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart -deactivate -configure -access -off

Problems connecting with your VNC client, like Chicken of the VNC?

Set your remote display settings to greyscale (to speed up things) or ‘Let server decide). Anything lower than ‘thousands’ won’t work.

defaults write com.apple.ScreenSharing controlObserveQuality 2