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    crontab syntax: date/time parameters

    • Article Type: General
    • Product: Aleph
    • Product Version: 20

    Description:
    What are the columns in the crontab line?

    Resolution:
    Crontab syntax :

    A crontab file has five fields for specifying day , date and time followed by the command to be run at that interval.

    * * * * * command to be executed
    - - - - -
    | | | | |
    | | | | +----- day of week (0 - 6) (Sunday=0)
    | | | +------- month (1 - 12)
    | | +--------- day of month (1 - 31)
    | +----------- hour (0 - 23)
    +------------- min (0 - 59)

    * in the value field above means all legal values as in braces for that column.
    The value column can have a * or a list of elements separated by commas. An element is either a number in the ranges shown above or two numbers in the range separated by a hyphen (meaning an inclusive range).


    • Article last edited: 10/8/2013