---
syntax: markdown
tags: [tldr, common]
source: https://github.com/tldr-pages/tldr.git
---
# 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:...}}`
