Haskell: doesFileExist: Check for file existence

System.Directory module provides doesFileExist function, which return true if the file exist, else false.

Prelude System.Directory> :t doesFileExist 
doesFileExist :: FilePath -> IO Bool
Prelude System.Directory> 
Prelude System.Directory> doesFileExist  "/Users"
False
Prelude System.Directory> doesFileExist  "/Users/harikrishna_gurram/academyLogin.log"
True

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