09-17-2018
Yes, I fell over the some 20 years ago with the same result. It seems that
cron does not make sure that all conditions for the day match, so you may find that it runs every day between 15th & 21st each month AND every Sunday.
You would think that what you have set up is perfectly sensible, but sadly the
cron designers had other ideas.
I got round this by running a shell script everyday that decided if I was on the correct day and correct week, and if so then it progressed to run the script I really wanted. it is annoying and I sympathise, but that was my way round it.
From the crontab file manual (
man 5 crontab) I get this:-
Quote:
Note: The day of a command's execution can be specified by two fields - day of month, and day of week. If both fields are restricted (ie, aren't *), the command will be run when
either field matches the current time. For example,
"30 4 1,15 * 5" would cause a command to be run at 4:30 am on the 1st and 15th of each month, plus every Friday.
I hope that this helps,
Robin
This User Gave Thanks to rbatte1 For This Post:
10 More Discussions You Might Find Interesting
1. HP-UX
Hi,
I have a cron schedule like this
04,16,28,40,52 * * * * /nag/startProcessABatch (unix script)
i want to add new lines in this file (like Logging), i just copy this file into a /tmp folder (for backup copy), and i have edited this file (added few lines of code for logging).
... (1 Reply)
Discussion started by: nag_sundaram
1 Replies
2. UNIX for Advanced & Expert Users
hi,
i have the following line in the crontab
15 5 * * 6 /home/adw/BCE_ADW.pl
The problem is the cron job is not getting started automatically.
But this was working til last week. now it is not working.
what could be the problem. Any idea? (3 Replies)
Discussion started by: Suguna
3 Replies
3. UNIX for Dummies Questions & Answers
Hi All,
I am editing crontab using -e option to add a new job
Below is the line
30 * * * * scriptpath
This job is not executing every thirty minutes.
I have checked, cron daemon is running.
What did I miss? Can some one help?
I am using cron shell..ksh (7 Replies)
Discussion started by: yabhi_22
7 Replies
4. Shell Programming and Scripting
I want to create a cron job randomly once a day for my site's registration.
The responsible file for registrations is a config file and I need to change the contents
twice on day (on and off)
I know the way for random cron job for example
*/n * * * * /usr/local/bin/php... (6 Replies)
Discussion started by: lucker
6 Replies
5. UNIX for Advanced & Expert Users
Hi,
Is there a way to schedule a job in Autosys to run every 5th Day of Month without using custom calendar?
Thanks. (1 Reply)
Discussion started by: vbhatnag
1 Replies
6. Solaris
Hi,
I have set up the crontab as follows.
root@IDC4VASAPP07 # crontab -l
0-59 * * * * /var/tmp/r.sh
0-59 * * * * date >> /var/tmp/log
root@IDC4VASAPP07 #
r.sh is as follows.
root@IDC4VASAPP07 # cat r.sh
#!/bin/bash
dt1=$(perl -e 'use POSIX;print strftime... (10 Replies)
Discussion started by: SunilB2011
10 Replies
7. Shell Programming and Scripting
Hi
I want to execute a cron job everyday at 14:50 hrs. I have a script like this:
TMP_FILE="/tmp/tmpcron.txt"
RES=0
/usr/bin/crontab -l >> $TMP_FILE
ADD_JOB="50 14 * * * /opt/mypath/scriptname.sh"
grep "scriptname.sh" $TMP_FILE >> /dev/null
JOB_NOT_EXIST=$?
if test $JOB_NOT_EXIST... (2 Replies)
Discussion started by: saurabhkoar
2 Replies
8. UNIX for Advanced & Expert Users
Hi,
I want to run a job in cron on a specific date(say 25th of every month) excluding holidays. Can anyone provide some hints to do this? Thanks for any inputs. (1 Reply)
Discussion started by: sktkpl
1 Replies
9. Solaris
Hi ,
I have removed a cron for particular user , but cron job seems to be running even after the cron entry is removed. The purpose of the cron was to sendmail to user ( it uses mailx utility )
I have restarted cron and sendmail service still user is getting mail alerts from the cron job. And... (4 Replies)
Discussion started by: chidori
4 Replies
10. Shell Programming and Scripting
Hi All,
I am writing a script that will eventually be executed by a cron job every 15 minutes. I want to make sure that my logic/script doesn't get executed if a previous job is still running. What would be the best way to handle that scenario? I was thinking to make my script create a temporary... (1 Reply)
Discussion started by: rdogadin
1 Replies
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)