Commands that starts with : are ghci commands not haskel commands
:load <file> # load file
:reload # reload file
:type <expression> # get type of expression
:quit # quit ghci
:tail "hello" # get tail of string
if you see a error msg with it in it ,it is the default variable name haskel uses
ghci>9/2 (does usual division)
4.5
ghci>9 `div` 2 (does int division)
4
you can only use div on whole number types like Int and Integer, and you can only use / on decimal types like Double.