haskell and Unix shell scripting

Question

is there any possibility to use haskell functions in unix shell scripts?

for instance:

#!/bin/bash

...
var1=value
...

# use haskell function with input from shell variable var1
# and store the result into another shell variable var2

var2=haskellFunction $var1

...

I want to use variables in shell scripts as arguments and results of haskell functions

Thanks in advance.

jimmy

Answer 1

Use the -e switch to ghc, e.g.

var2=$(ghc -e "let f x = x*x + x/2 in f $var1")

For string processing, it is best to use Haskell's interact in conjunction with bash's here strings:

var2=$(ghc -e 'interact reverse' <<<$var1)