ghci

The Glasgow Haskell Compiler's interactive environment. More information: https://downloads.haskell.org/ghc/latest/docs/html/users_guide/ghci.html.

• Start a REPL (interactive shell):

ghci

• Start a REPL and load the specified Haskell source file:

ghci source_file.hs

• Start a REPL and enable a language option:

ghci -Xlanguage_option

• Start a REPL and enable some level of compiler warnings (e.g. all or compact):

ghci -Wwarning_level

• Start a REPL with a colon-separated list of directories for finding source files:

ghci -ipath/to/directory1:path/to/directory2:…