* * * * * root /app/run_app.sh >> /var/log/cron.log 2>&1

#* * * * * *
#| | | | | | 
#| | | | | +-- Year              (range: 1900-3000)
#| | | | +---- Day of the Week   (range: 1-7, 1 standing for Monday)
#| | | +------ Month of the Year (range: 1-12)
#| | +-------- Day of the Month  (range: 1-31)
#| +---------- Hour              (range: 0-23)
#+------------ Minute            (range: 0-59)
# Cron requires a blank space at the end of the file so leave this here.