1. 格式

--------------------------------------------------------minute of the hour (0-59)
|    -----------------------------------------------------hour of the Day (0-23)
|    |   --------------------------------------------------Day of the Month (1-31)
|    |   |   ------------------------------------------------Moth of the year(1-12)
|    |   |   |  ---------------------------------------------Day of the Week (0-6 for Sunday through Saturday)
|    |   |   |  |  ------------------------------------------Command to Execute (Full path is required)
|    |   |   |  |  |
15 3 8 1 * /usr/local/bin/somescript.sh 2>&1 > /dev/null