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Asked: 2026-05-16T10:02:24+00:00

When I use GHCi, I almost always end up importing Control.Applicative , Data.List ,

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When I use GHCi, I almost always end up importing Control.Applicative, Data.List, etc. . Is there a way to configure GHCi to automatically import those modules.

Also, after importing them, how do I keep the prompt from being insanely long?

Prelude Control.Applicative Data.List Database.HDBC Database.HDBC.Sqlite3 System.Directory>
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1 Answer

  1. Editorial Team

    GHCi looks for its configuration file at

    • ~/.ghc/ghci.conf on Unix-like systems.

    • %APPDATA%\ghc\ghci.conf on Windows.

    The configuration file syntax is simple: it’s a list of GHCi commands to execute on startup.

    For example, your ghci.conf could contain:

    import Control.Applicative
import Data.Char
import Data.List

:set prompt "> "

    The last line sets the prompt to "> " so it won’t show all the modules you imported on the command line.

    Now you can get to work right away:

    GHCi, version 6.12.1: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
> toLower <$> "Hello, world!"
"hello, world!"
>

    Also, if you decide you don’t want Data.Char in the middle of a GHCi session, you can remove it with:

    :m -Data.Char

    and if you decide you don’t want anything but Prelude during a session:

    :m
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