ghci

The Glasgow Haskell Compiler's interactive environment.

TLDR

Start a REPL (interactive shell)

$ ghci
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Start a REPL and load the specified Haskell source file

$ ghci [source_file.hs]
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Start a REPL and enable a language option

$ ghci -X[language_option]
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Start a REPL and enable some level of compiler warnings (e.g. all or compact)

$ ghci -W[warning_level]
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Start a REPL with a colon-separated list of directories for finding source files

$ ghci -i[path/to/directory1]:[path/to/directory2]
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