deleteDummyFiles custom command

deleteDummyFiles.groovy

"deleteDummyFiles" : { prefix, xFiles -> 			
			def p = ~/$prefix.*\.txt/
			def counter=0
			def howManyfiles = xFiles.toInteger()
			println "Deleting ${howManyfiles} .txt files '${prefix}*' in ${dummyFilesFolder} ..."
			new File(dummyFilesFolder).eachFileMatch(p) {f ->
				if ( counter < howManyfiles ) {		
					counter++
					println "Deleting file #${counter} ${f.getName()} ..."
					f.delete()
				}
			}
			println "Done deleting all .txt files in ${dummyFilesFolder} "
			return "Done"
		}