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Module: Prelude
Function: readFile
Type: FilePath -> IO String
Description:
Related: appendFile, writeFile

Example 1
File: /tmp/foo : 

BBBCCC

Program source: 

main = do x <- readFile "/tmp/foo.txt"
	  putStr x

Output: BBBCCC

Example 2
File: /tmp/foo.txt : 

[1,2,4,6,7]

Program source: 

main = do x <- readFile "/tmp/foo.txt"
	  y <- rList x
	  print (sum y)

rList :: String -> IO [Int]	  
rList = readIO

Output: 20