The crontab file has a specific format (_ means space):

• The crontab file has a specific format (_ means space):

Minute _ Hour _ Day of Month _ Month _ Day of Week _ [username] _ command list

• * Both 0 and 7 represent Sunday

• Ranges of values can be specified using the dash (-).

• Comments can be placed in the crontab file by putting the # symbol in front of them.

• Blank lines are allowed.