I think I could have most of the oneliner goodness of h4sh, without having to do the module install, if I could figure out a way to include modules with ghc -e.
i confess myself to be among those who underappreciated ghc -e, until this thread:) as Joachim said (thanks for starting this, btw;-), we can use qualified names $ echo hello world | hmap 'map Char.toUpper' HELLO WORLD and to get at your other methods, the question is not how to include modules with ghc -e; instead, recall that ghc -e supplies a command to be evaluated within the context of its parameter module (single input for a ghci session): $ cat Imports.hs import Debug.Trace helper x = trace "hi there" (x+1) $ ghc -e 'helper 41' Imports.hs hi there 42 as to the original question in this thread, my .bashrc now also has a few less symmetric entries: function hrunl { ghc -e "interact(show.($*).lines)"; } function hrunw { ghc -e "interact(show.($*).words)"; } function hrunwl { ghc -e "interact(show.($*).map words.lines)"; } using which the one-liner becomes something like find -maxdepth 1 -type f | xargs du | hrunwl "sum . map (read . head)" (the find/du is better left in shell tool land, it seems, and default Num is Integer) hth, claus