Mac OS X uses a system similar to Unix and Windows for file permissions in that they can be a assigned to the owner, or a group or an individual. Access permissions have the following options: Read and Write, Read Only, Write Only or No Access. The creator of a folder automatically has full access to it and its contents. You can change the settings of the folder to make it available to others. If you did not create the folder you will need the administrator’s password to complete the process.
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Open a Finder window and go to the folder that contains the subfolder you wish to change the permissions for. Click on the subfolder, but don’t open it. Just click on it once to highlight it.
Choose “File” from the menu bar and then select “Get Info.” Click on the “Sharing and Permissions” disclosure triangle. If you do not own the folder click the lock icon and enter the administrator’s username and password.
Click the plus symbol in the bottom left corner of the “Get Info” window. You can now select a user or group from a pick list. On each line next to the user or group, you should select the permission level. You can choose from Read and Write, Read Only, Write Only and No Access.
Apply the same settings to all the items in the folder by clicking on the gear symbol in the “Get Info” window. This will open the Action pop-up menu. Select “Apply to enclosed items” from this menu.
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