Here is a technique I use to recursively change all of the file or folder permissions within a directory using the terminal. It will find all of the files or folders and change their permissions accordingly using the chmod command.

For Directories:

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find /the/path/to/your/targeted/directory/ -type d -exec chmod 755 {} \;

For Files:

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find /the/path/to/your/targeted/directory/ -type f -exec chmod 644 {} \;