The problem with using DOW is that there are 7 days - plus sunday may not be day 0 depending on your locale. 7 does not divide evenly by 3.
If you literally want every third day try setting up a daily cron entry that checks for "thirdness"
is the number of days since Jan 1 1970. # of days % 3 == 0 means it is a day divisible evenly by three.
This trick works for any weird number of days that don't track well as a DOW or a fixed day in the month.
Last edited by jim mcnamara; 08-18-2009 at 08:21 AM..
hello there,
i'm learning about task scheduling with cron and all seems hyper exciting, yeppie. But there is a prob:
assume i have a script that needed to be executed at 7am everyday. I could do:
vi mycron
00 7 * * * echo hi mother, i wanna be a script daddy.
:wq
crontab mycron
how... (4 Replies)
Is there a way in AIX to schedule a script to run bi-weekly through cron?
I have a script that needs to run every other Wednesday, and this is what I thought I had to enter in the crontab file:
00 08 * * 3/2 /home/user/user.script
It didn't like that. It reports a syntax error. I'm almost... (5 Replies)
I would like to setup a cron job to run a command from another directory.
What is the best way to do this?
The cron file is in a directory and the script I want it to run is in another directory.
I tried doing this in the cron file:
/location/of/command/run.sh
But that did not work.... (2 Replies)
Hello, is it possible to schedule cron jobs using business days instead of calendar days? I need to run several jobs on first and third business days of the month. I currently have this cron-tab entry which runs every week day at 5 AM. I need to schedule the same job on the 3rd Business day of the... (8 Replies)
Hi Everybody,
I want to run a script at every 5 seconds. I know how to run it every 5 minutes, is there any possibility to run a script at 5 seconds interval.
Regards,
Mastan (3 Replies)
Hi,
I created this cron job for asterisk to send sms daily to a number
#!/bin/sh
#custom mod - send sms once a day, at 07:00.
CRON_PATH="/etc/asterisk/gw/crontabs_root";
if ! grep 'gsm send sms' $CRON_PATH > /dev/null 2>&1 ;then
echo "* 7 * * * asterisk -rx 'gsm send sms 1 7666... (4 Replies)
Discussion started by: jazzyzha
4 Replies
LEARN ABOUT OSF1
cron
cron(8) System Manager's Manual cron(8)NAME
cron - The system clock daemon
SYNOPSIS
/usr/sbin/cron
DESCRIPTION
The cron daemon runs shell commands at specified dates and times. Commands that are to run according to a regular or periodic schedule are
found within the crontab files. Commands that are to run once only are found within the at files. You submit crontab and at file entries
by using the crontab and at commands. Because the cron process exits only when killed or when the system stops, only one cron daemon
should exist on the system at any given time. Normally, you start the cron daemon from within a run command file.
During process initialization and when cron detects a change, it examines the crontab and at files. This strategy reduces the overhead of
checking for new or changed files at regularly scheduled intervals. The cron command creates a log of its activities. The cron daemon
must be started from the system startup scripts because it must begin execution without a login user ID set. The cron daemon starts each
job with the following process attributes stored with the job by the invoking process: Login user ID Effective and real user IDs Effective
and real group IDs Supplementary groups
It also establishes the following attributes from the authentication profile of the account associated with the login user ID of the invok-
ing process: Audit control and disposition masks Kernel authorizations
DIAGNOSTICS
The at and batch programs will refuse to accept jobs submitted from processes whose login user ID is different from the real user ID.
FILES
Specifies the command path. Main cron directory Directory containing the crontab files. List of allowed users. List of denied users His-
tory information for cron Queue description file for at, batch, and cron
RELATED INFORMATION
Commands: at(1), crontab(1), rc0(8), rc2(8), rc3(8)
Files: queuedefs(4) delim off
cron(8)