OS X 10.11 El Capitan there’s a new native Copy Pathname option built directly into the Finder. It will copy the complete pathname of a file or folder directly to the clipboard.
Here’s what you need to do to copy any items path name directly to the clipboard from anywhere in the file system:
Step 1. Open Finder
Step 2. Navigate to the file or folder you wish to copy the path for
Step 3. Right-click (or Control+Click, or a Two-Finger click on trackpads) on the file or folder in the Mac Finder
Step 4. While in the right-click menu, hold down the OPTION key to reveal the “Copy (item name) as Pathname” option, it replaces the standard Copy option
Step 5. Select copy and it’s ready to be pasted anywhere
The copied pathname is always the complete path, it’s not relative.