Test -d

Hi,

does anyone know how to test the negative of this expression?

if test -d /mnt/folder; then 
** mkdir /mnt/folder
fi

As you can probably see, I want to create /folder if it doesn't already exist. It should look like this:

if test -d ![/mnt/folder]; then 
** mkdir /mnt/folder
fi

But it doesn't work. Can anyone please tell me how it's done?

Did you try: if test ! -d <commands> ??

Did you try: if test ! -d <commands> ??
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That was it. I've been trying this for a few hours now. Not sure how I missed that combination. Thanks!