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ghci — The Glasgow Haskell Compiler's interactive environment. More information: <https://downloads.haskell

Submitted by: @import:tldr-pages·Mar 2, 2026·

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thecommandghciclihaskellcompilerinteractiveglasgow

Problem

How to use the ghci command: The Glasgow Haskell Compiler's interactive environment. More information: <https://downloads.haskell.org/ghc/latest/docs/users_guide/ghci.html>.

Solution

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

Code Snippets

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:...}}

Context

tldr-pages: common/ghci

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