Explanation of
Code:
0 6 * * 5 /usr/bin/calibre-upgrade.sh > /dev/null 2>&1
cron jobs (when viewed as a configuration file, not in the GUI) take the form of:
five numbers, separated by spaces, followed by the command to be carried out.
The numbers say when to do it:
Quote:
first number = minute, 0-59
second number = hour, 0-23
third number = day of month, 1-31
fourth number = month, 1-12
fifth number = day of the week, 1-7 is monday through sunday
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asterisks are the wildcard, so they mean on all possible days/minutes/hours.
0 6 * * 5 is saying, at
0 minutes of the
6th hour, or 6:00, (army time) on
any day of the month or
any month of the year, but only if it is a
friday, do this job.