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+-- If you're on a Unix-like system, look through the documentation for the
+-- System.Posix.Files module, and see if you can find a replacement for the
+-- doesNameExist function.
+
+-- The replacement is the fileExist function that checks for existence of both
+-- regular file and directories.
+
+ghci> :module + System.Posix.Files
+
+ghci> fileExist "nonexistent_file"
+False
+
+-- Regular file
+ghci> fileExist "8_b_2.txt"
+True
+
+-- Directory
+ghci> fileExist "../ch08/"
+True