tldr/pages/common/ghci.md

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# 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:...}}`