Helpful documentation: https://help.ubuntu.com/community/CronHowto

Notes

• Cronjobs must have a trailing newline at the end, or they won’t run

• &> won’t work in cron. Use something like this instead:

  command > output.txt 2>&1
  

• Cron won’t have the same environment variables set. You can test your command using env:

  env -i sh -c 'cd /home/user/Desktop; JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64 /home/user/.gvm/grails/current/bin/grails run-script scripts/Test.groovy --stacktrace &> /home/user/Desktop/test.txt'