Changing directory permissions depending on file type

I have a dir, say /mydir, with literally hundreds of other subdirs in it. Probably thousands.

I want to assign 775 permissions to every dir under /mydir, and 664 to every file. This needs to be recursive, as some dirs under /mydir also have several subdirs inside.

I tried:

#chmod 775 * -R

but this changes EVERYTHING at once. I don't know how to discriminate among dirs an files.

I'm sure this can be done with a shell script, but I'm not very versed in shell scripting.
If no one has an already made script, I could definitely use some pointers.

Thanks.
Poisa
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poisaAsked:
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jlevieConnect With a Mentor Commented:
It's a two step process, like:

find /mydir -type d -exec chmod 0755 {} \;
find /mydir -type f -exec chmod 0664 {} \;
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