minute (0-59), hour (0-23), day of the month (1-31), month of the year (1-12), day of the week (0-6 with 0=Sunday).
Each of these patterns may be either an asterisk (meaning all legal values) or a list of elements separated by commas. An element is either a number or two numbers separated by a minus sign (meaning an inclusive range). Notice that the specification of days may be made by two fields (day of the month and day of the week). Both are adhered to if specified as a list of elements. See EXAMPLES.
The sixth field of a line in a crontab file is a string that is executed by the shell at the specified times. A percent character in this field (unless escaped by \) is translated to a NEWLINE character.
Only the first line (up to a `%' or end of line) of the com- mand field is executed by the shell. Other lines are made available to the command as standard input. Any blank line or line beginning with a `#' is a comment and will be ignored.
EXAMPLES Example 1: Cleaning up core files
This example cleans up core files every weekday morning at 3:15 am: