How to write to mounted disc image

I need to add a file to a disc image I created, but it always comes up no write no matter what I do.
Anyone know a good tip to do this?
Thanks.

That sounds excellent, thanks.
I also found this old tip on Mac OSX Tips. In Terminal type:
hdiutil attach yourDisc.dmg -shadow /tmp/yourDisc.shadow -noverify
You can then write to the shadow image, and make a disc image copy of the mounted shadow.
I think yours is a bit quicker though, but I thought you might enjoy this anyway in a pinch.

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