runghc
Run Haskell programs without compilation
TLDR
Run Haskell script
SYNOPSIS
runghc [options] [ghc-options] file [args]
DESCRIPTION
runghc runs Haskell source files directly without a separate compilation step, making it ideal for scripting and quick prototyping. It invokes GHC (Glasgow Haskell Compiler) behind the scenes to compile the program to a temporary location and execute it immediately, providing a scripting-like experience for Haskell code.
The tool supports shebang lines (#!/usr/bin/env runghc), enabling Haskell files to be used as executable scripts. Command-line arguments after the filename are passed to the Haskell program, and GHC options can be specified before a -- separator. The synonym runhaskell is also available.
PARAMETERS
--
Separator for GHC options.-f file
Use different GHC.--help
Show help.--version
Show version.
EXAMPLES
runghc hello.hs
# With arguments
runghc calculator.hs 2 + 3
# Pass GHC options
runghc -- -Wall script.hs
# Shebang usage
#!/usr/bin/env runghc
SCRIPT EXAMPLE
import System.Environment
main = do
args <- getArgs
putStrLn $ "Hello, " ++ head args
ALTERNATIVES
ghci # Interactive (load with :load)
ghc -e # One-liner
CAVEATS
Slower than compiled code. Recompiles each run. For performance, use ghc to compile.
HISTORY
runghc is part of GHC (Glasgow Haskell Compiler), the primary Haskell compiler developed by the GHC team.