Haskell: Hello World program using runghc command

'runghc' command comes with Haskell distribution, used to run Haskell programs without compiling.

Syntax

runghc [runghc flags] [GHC flags] module [program args]

Use the command 'runghc --help', to get more information about the command runghc.

$ runghc --help
Usage: runghc [runghc flags] [GHC flags] module [program args]

The runghc flags are
    -f /path/to/ghc       Tell runghc where GHC is
    --help                Print this usage information
    --version             Print version number

hello_world.hs

main = putStrLn ("hello, world")

$ runghc hello_world.hs
hello, world

It is not necessary to use ‘.hs’ extension after the Haskell file name.    

$ runghc hello_world
hello, world

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