Kotlin for scripting

Kotlin can also be run as a script. If bash or Perl is not for you, now you have an alternative.

Say you want to delete all files that are older than N given days. The following code example does just that:

    import java.io.File 
    val purgeTime = System.currentTimeMillis() - args[1].toLong() * 24  * 60 * 60 * 1000 
    val folders = File(args[0]).listFiles { file -> file.isFile } 
    folders ?.filter { 
      file -> file.lastModified() < purgeTime } 
    ?.forEach { 
      file -> println("Deleting ${file.absolutePath}") 
      file.delete() 
    } 

Create a file named delete.kts with the preceding content. Note the predefined variable args, which contains all the incoming parameters passed when it is invoked. You might wonder what the ? character is doing there. If you are familiar with the C# language and you know about nullable...