You can open the current terminal working directory and display it in the Finder using:

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open .

You might also be interested in knowing how to:

Open the current parent directory in Finder

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open ..

Open a specific directory in Finder

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open dir1/dir2

Open a file with the default application

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open file.txt

Open multiple files:

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open file1.txt file2.txt file3.txt

Open a file while specifying the application

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open -a preview pic1.jpg