I'm looking for something like
$ stack whereis hasktags
where whereis acts more or less like UNIX whereis command. hasktags is to be run like this:
$ stack exec -- hasktags
stack exec -- whereis hasktags will do.
stack exec -- whereis yourprogramname works for me on a Linux box, but I have to use stack exec -- which yourprogramname on Mac OS X.
(which also works on Linux, of course.)
Note that neither of these are useful for automating deployments when the executable name is the same as one on the build machine -- not likely, but not impossible.
来源：https://stackoverflow.com/questions/47852911/haskell-stack-locate-the-executable