tldr/pages/common/ghci.md

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 -X{{language_option}}

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

ghci -W{{warning_level}}

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

ghci -i{{path/to/directory1}}:{{path/to/directory2}}