How can Haskell utilize a file argument from the command line using ".."?

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In Haskell, the file argument from the command line can be utilized using the System.Environment module. The ".." argument specifies the parent directory.

Here is an example code snippet:

import System.Environment

main = do
    args <- getArgs
    let fileName = "../" ++ head args -- add ".." prefix to file name
    fileContents <- readFile fileName
    putStrLn fileContents

In this example, we use the getArgs function to retrieve the command line arguments. We use the head function to get the first argument, which is assumed to be the file name. We then add the ".." prefix to the file name using the ++ operator. Finally, we use the readFile function to read the contents of the file and print it to the console using the putStrLn function.