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shellscalascriptingscala-script

Shorter Scala Script header

It's possible to write shell scripts in Scala by starting a text file with:

#!/bin/sh
exec scala "$0" "$@"
!#

To ease script creation, I would like to write an executable called scalash (perhaps a BASH script) allowing to shorten Scala script header to just one line:

#!/bin/scalash

Is it possible ? Extra points if I can pass optional parameters to scalash, for instance to add classpath dependencies.

Solution

  • In Scala 2.11, you can do it as follows (exactly as with most other languages):

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

    In Scala 2.9.0.1, you can simply create the following script:

    test.scala

    #!/usr/bin/scala
!#
println(args.mkString(" "))

    and make it executable. (change the first line to path to your executable)

    Usage:

    # ./test.scala Hello world!
Hello world!