Here
Now for the more complicated second part of a crontab file.
An entry in cron is made up of a series of fields, much like the
/etc/passwd file is, but in the crontab they are
separated by a space. There are normally seven fields in one entry. The
fields are:
minute hour
dom month dow cmd
minute:
This controls what minute of the hour the command will run on,
and is between '0' and '59'
hour: This controls what hour the command will run on, and is
specified in the 24 hour clock, values must be between 0 and 23 (0 is
midnight)
dom: This is the Day of
Month, that you want the command run on, e.g. to run a command on the
19th of each month, the dom would be 19.
month: This is the month a specified command will run on, it may be
specified numerically (0-12), or as the name of the month (e.g. May)
dow: This is the Day of
Week that you want a command to be run on, it can also be numeric (0-7)
or as the name of the day (e.g. sun).
cmd: This is the command
that you want run. This field may contain multiple words or spaces.
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