10-08-2001
I must first say that I am fairly new to Unix and know very little about cronjobs, but your question intrigued me. My first question to you would be what OS are you using? The majority of my experience is with Solaris 7, so I will be speaking in terms of that.
I read the man pages on crontab and found the six fields that make up the crontab entry format:
1. Minute (0-59)
2. Hour (0-23)
3. Day of the Month (1-31)
4. Month of the Year (1-12)
5. Day of the Week (0-6) 0 being Sunday.
6. the executable string
So say you want to run your cronjob at midnight on the first Monday of ever month, it appears that the first 5 fields should look something like this:
0 0 1-7 * 1
My thinking:
0 - Is the first minute of that day
0 - Is the first hour of that day
1-7 - The first Monday has to fall within the first seven days of the month.
* - Every month
1 - Only on Mondays
Unless I am misreading the man pages, it seems like this should work. I am going to attempt to set up a cronjob and test it.
Best regards.
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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)