12-14-2010
Quote:
Originally Posted by
fed.linuxgossip
Hi,
the path is /temp not /tmp . Moreover this is a assignment script only, not to be used in production. Plus this needs to run as a service, is running a cron necessary?
Thanks
Lots of school class code ends up in production, so why not pretend harder and get extra points? It just feels like teaching bad practice.
cron has startup costs for each test, but solves the restart on reboot problem intrinsically.
By service you just mean nohup daemon looping, sleeping? Well, after you solve the reboot problem, the total might be more complex than a good cron line. Most of the effort goes into data processing to turn the points into a report. I suppose you could look at (today) 3:05 and see the system has been up from 2010-09-31 08:35 to (today) 3:00 and just update it to say 3:05, but then you might get an error when half updated or something such. If you mmap() a file, it could be a binary update of one int.
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CRON(8) System Manager's Manual CRON(8)
NAME
cron - clock daemon
SYNOPSIS
auth/cron [-c]
DESCRIPTION
Cron executes commands at specified dates and times according to instructions in the files /cron/user/cron. It runs only on an authentica-
tion server. Option -c causes cron to create /cron/user and /cron/user/cron for the current user; it can be run from any Plan 9 machine.
Blank lines and lines beginning with # in these files are ignored. Entries are lines with fields
minute hour day month weekday host command
Command is a string, which may contain spaces, that is passed to an rc(1) running on host for execution. The first five fields are integer
patterns for
minute 0-59
hour 0-23
day of month 1-31
month of year 1-12
day of week 0-6; 0=Sunday
The syntax for these patterns is
time : '*'
| range
range : number
| number '-' number
| range ',' range
Each number must be in the appropriate range. Hyphens specify inclusive ranges of valid times; commas specify lists of valid time ranges.
To run the job, cron calls host and authenticates remote execution, equivalent to running rx host command (see con(1)). The user's profile
is run with $service set to rx.
Cron is not a reliable service. It skips commands if it cannot reach host within two minutes, or if the cron daemon is not running at the
appropriate time.
EXAMPLES
Here is the job that mails system news.
% cat /cron/upas/cron
# send system news
15 8-17, 21 *** helix /mail/lib/mailnews
%
SOURCE
/sys/src/cmd/auth/cron.c
SEE ALSO
con(1), rc(1)
CRON(8)