How do you mount a device like normal unix?

Hi,
I'm trying to secure some files by encrypting a disk image (DMG file). I'm doing everything through the terminal so that I can script it.
For the first step I want to mount the disk image file. But, I'm struggling to find a way to mount the disk image so that it becomes a normal part of the file system. Under Linux I would do something like this:
$ mount -t ext3 /dev/hda1 /home/steve/projects/privatemount
Under Mac OS X, I can't get it to work. I found a hdiutil command but there are all sorts of issues between it and the Finder. The closest I've got is this:
$ hdiutil attach -verbose -nobrowse -mountpoint /Users/steve/Projects/privmount /Users/steve/Projects/private-encrypted.sparseimage
Which mounts it as a directory from terminal (great), and doesn't show it up in the Finder as a removable device (great). But, the problem is that you can unmount it (hdiutil detach) while you're accessing the directory i.e editing a file. This is no good because I could lose files (seems like a bug to me). If I edit the file from vim from the command line then lsof shows the file being used. But if you access the file through the Finder i.e edit it with textmate, then lsof doesn't see the file access!
Does anyone know what the magic incantation is to mount a device from the terminal as you would a normal UNIX, have the Finder not show it as a removable device, and ensure that you can't unmount it while a user is accessing the contents?
Thanks,
Steve

Hi Bill,
Yeah that works but it shows it as a removable disk (as your second post pointed out). I'm hoping there's a solution where it won't show up as a removable disk. It's just annoying not being able to stitch together a seamless file system from a bunch of disk images!
Thanks,
Steve

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*& TYPE POOLS DECLARATION                                              *
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      text
--> p1        text
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FORM VALIDATE_SCREEN .
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*&      Form display_data
      text
--> p1        text
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FORM DISPLAY_DATA .
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M_FIELDCAT 'NETWR' 'C' 'WAERK'.
M_FIELDCAT 'WAERK' '' ''.
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Regards
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