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ghcid — Simple and efficient CLI IDE for Haskell that reloads code on file changes. Continuously displays co

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

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Problem

How to use the ghcid command: Simple and efficient CLI IDE for Haskell that reloads code on file changes. Continuously displays compile errors, warnings, and test results. More information: <https://github.com/ndmitchell/ghcid>.

Solution

ghcid — Simple and efficient CLI IDE for Haskell that reloads code on file changes. Continuously displays compile errors, warnings, and test results. More information: <https://github.com/ndmitchell/ghcid>.

Start ghcid and monitor a Haskell file for changes:

ghcid {{path/to/Main.hs}}

Start ghcid with a specific command, such as loading a Stack or Cabal project:

ghcid --command "{{stack ghci Main.hs}}"

Run an action (default main) on each file save:

ghcid --run={{action}} {{path/to/Main.hs}}

Set maximum height and width (default to console height and width):

ghcid --height={{height}} --width={{width}} {{path/to/Main.hs}}

Write full GHC compiler output to a file:

ghcid --outputfile={{path/to/output_file.txt}} {{path/to/Main.hs}}

Execute REPL commands (eg. -- $> 1+1) on each file save:

ghcid --allow-eval {{path/to/Main.hs}}

Code Snippets

Start `ghcid` and monitor a Haskell file for changes

ghcid {{path/to/Main.hs}}

Start `ghcid` with a specific command, such as loading a Stack or Cabal project

ghcid --command "{{stack ghci Main.hs}}"

Run an action (default `main`) on each file save

ghcid --run={{action}} {{path/to/Main.hs}}

Set maximum height and width (default to console height and width)

ghcid --height={{height}} --width={{width}} {{path/to/Main.hs}}

Write full GHC compiler output to a file

ghcid --outputfile={{path/to/output_file.txt}} {{path/to/Main.hs}}

Context

tldr-pages: common/ghcid

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