Comment #2 on issue 393 by dunric...@gmail.com: XMonad.Prompt.Shell should use user-defined searchPredicate http://code.google.com/p/xmonad/issues/detail?id=393 Hi, I just fixed (at least for me) the issue shellPrompt ignores searchPredicate field of XPConfig record. After applying my patch, you can now create/combine whatever function you want and it will by used at filtering of shell commands completion. Just set searchPredicate field and pass it to shellPrompt. Of my xmonad.hs config: import qualified Data.List as L import Data.Char ... , ((myModMask, xK_x), shellPrompt defaultXPConfig { -- match a substring anywhere within and ignore case searchPredicate = L.isInfixOf . (map toLower) ... } Patch created for xmonad-contrib ver. 0.10 Take care :-) Attachments: shell-compl_predicate.patch 4.4 KB