Groovy tail -f using Apache Commons IO

tailLogFile.groovy

@Grapes([
    @Grab(group='commons-io', module='commons-io', version='2.4'),
    @Grab('log4j:log4j:1.2.17')
])
import org.apache.commons.io.input.*


import org.apache.log4j.*
import groovy.util.logging.*

@Log4j
class MyTailerListener extends TailerListenerAdapter {
      
      void handle(String line) {
         println line;
      }
      
      void fileRotated() {
          log.info "File is rotated."
      }
}

File logFile = new File("/var/logs/iibtest.log")

TailerListener listener = new MyTailerListener()
Tailer.create(logFile, listener)
 

Read more about other options on running the Tailer in the JavaDocs
http://commons.apache.org/proper/commons-io/javadocs/api-2.4/index.html