Add unix ls command to groovysh

Ls.groovy

// open groovysh
// execute :rc ls

import org.codehaus.groovy.tools.shell.CommandSupport
import org.codehaus.groovy.tools.shell.Groovysh

class Ls extends CommandSupport {
    protected Ls(final Groovysh shell) {
        super(shell, ':ls', ':dir')
    }

    public Object execute(List args) {
        println "ls -l".execute().text
    }
}

Ls.properties

command.description=List all files on current directory
command.usage=
command.help=List all files on current directory