Scripting with Scala: How to launch an uncompiled script?

Question

Apart from serious performance problems, Scala is a very powerful language. Therefore I am now using it frequently for scripted tasks inside Bash. Is there a way to just execute

Answer 1

The scala man page provides some examples on how to run Scala code fragments as if they were a script, for both Windows and non-Windows platforms (below examples copied from the man page):

Unix

   #!/bin/sh
   exec scala "$0" "$@"
   !#
   Console.println("Hello, world!")
   argv.toList foreach Console.println

Windows

   ::#!
   @echo off
   call scala %0 %*
   goto :eof
   ::!#
   Console.println("Hello, world!")
   argv.toList foreach Console.println

To speed up subsequent runs you can cache the compiled fragment with the -savecompiled option:

   #!/bin/sh
   exec scala -savecompiled "$0" "$@"
   !#
   Console.println("Hello, world!")
   argv.toList foreach Console.println

Update: as of Scala 2.11 (as noted in this similar answer), you can now just do this on Unix:

#!/usr/bin/env scala
println("Hello, world!")
println(args.mkString(" "))