Hi all, GHC 7.8 adds --show-options flag that prints all supported command line flags on standard output. This can be used to enable autocompletion of command line options for ghc in shells that support autocompletion. If you're using bash add this snippet to your ~/.bashrc file: <<<<<<<<<<<<< START # Autocomplete GHC commands _ghc() { local envs=`ghc --show-options` # get the word currently being completed local cur=${COMP_WORDS[$COMP_CWORD]} # the resulting completions should be put into this array COMPREPLY=( $( compgen -W "$envs" -- $cur ) ) } complete -F _ghc -o default ghc <<<<<<<<<<<< END Enjoy. Janek PS. I also added a wiki page: https://ghc.haskell.org/trac/ghc/wiki/AutocompleteGHCFlags Feel free to add instructions for other shells.