11 executes commands at specified dates and times according
12 to instructions in the files
13 .BI /cron/ user /cron\f1.
14 It runs only on an authentication server.
24 it can be run from any Plan 9 machine.
26 Blank lines and lines beginning with
28 in these files are ignored.
29 Entries are lines with fields
32 minute hour day month weekday host command
35 is a string, which may contain spaces, that is passed to an
40 The first five fields are integer patterns for
43 .TP \w'month\ of\ year\ \ 'u
61 The syntax for these patterns is
71 Each number must be in the appropriate range.
72 Hyphens specify inclusive ranges of valid times;
73 commas specify lists of valid time ranges.
79 and authenticates remote execution, equivalent to running
85 The user's profile is run with
95 will run the command as
97 on the local machine without using
101 is not a reliable service.
102 It skips commands if it cannot reach
104 within two minutes, or if the
107 not running at the appropriate time.
109 Here is the job that mails system news.
112 % cat /cron/upas/cron
114 15 8-17,21 * * * helix /mail/lib/mailnews
121 lock file to prevent multiple
125 .B /sys/src/cmd/auth/cron.c