There is another solution to this problem, but you have to add some code to your `myscript.sh'. Put some kind of lock while your program is runing, e.g. if your program is a shell script, you can add the following lines:
I prefer this kind of coding in such cases, because it's better to protect this kind of programs to run overlaping processes. So, either you prefer cron, or sleeping nohup shell scripts, the process is vulnerable to run in simultaneus instances; if you use some kind of locking this is impossible.
Bye...
test.ksh
===================
#!/usr/bin/ksh
APPLICATION=hr_app
APPLICATION_UPPER=`echo $APPLICATION | tr `
echo $APPLICATION_UPPER > /tmp/test.txt
echo $APPLICATION >> /tmp/test.txt
which tr >> /tmp/test.txt
===================
When I run this from the shell:
/home/natter> more... (6 Replies)
I have a script in the same directory as some files and directories im trying to tar up and I have it run in cron. Well it runs but says it can't find the directories, you need to be in the directory where the script is for it to work. Here is my cron and script its crappy but it does the trick =).... (3 Replies)
I started a cron job on a cluster super computer. I am just a usual user over there and has no root power. The cron job was set by using "crontab -e". It excecutes a perl command every 20 minutes. I could use crontab -l or crontab -r to list or remove the cron job. However, I just found that I... (2 Replies)
Hi everyone, I am having a problem with a cron, I am using Solaris 10 and need to run a php file every 5 minutes. I can run the file from the test user, but the cron does not seem to run. I do not see anything about it in /var/cron/log but see crons for other users running. What should I look... (10 Replies)
My shell script runs fine both as a cron job and when i issue it.
However, I wish to differentiate when it runs as a cron-job so the "echo" statements are not issued (they get mailed to me, which i don't want).
I tried checking $USER but since the cron was created in my user that does not... (5 Replies)
Status quo is, within a web application, which is coded completely in php (not by me, I dont know php), I have to fill out several fields, and execute it manually by clicking the "go" button in my browser, several times a day.
Thats because:
The script itself pulls data (textfiles) from a... (3 Replies)
Hi,
The following shell script runs without any problem when executed manulally.
USED=$(df -h /arch | tail -1 | awk '{print $5}' | cut -d '%' -f 1)
if
then
find /arch/AUBUAT/ -type f -mtime +0 | xargs rm
find /arch/AUBMIG/ -type f -mtime +0 | xargs rm
fi
But the same gives below... (6 Replies)
If I run 'who -u' interactively or from a script invoked through bash in a tty on my Ubuntu 12LTS box I get an output like this:
testuser pts/0 Dec 9 02:32 . 2163 (host.xx.yy)
running the same through cron I get:
testuser pts/0 2012-12-09 02:32 00:05 2163... (2 Replies)
Hi,
1)
If some job supposed to run on 1st of every month at 7 AM
In cron job when we have a blackout on the 1st ( i.e when 1st falls on a sunday ) how can we make the job run the next business day?
2) How can we run a job on 25th of every quarter 7 AM(jan,apr,jul,oct)
And if 25th... (5 Replies)
Hello Lads,
I deployed a script on my mac to start and stop EC2 instances on AWS console. The script when started manually on the terminal does the expected stop and start. Problem is when i try to schedule it on a cron, it fails to recognize the AWS Keys which i set up as ENV variable by... (2 Replies)
Discussion started by: Irishboy24
2 Replies
LEARN ABOUT REDHAT
cron
CRON(8) System Manager's Manual CRON(8)NAME
cron - daemon to execute scheduled commands (Vixie Cron)
SYNOPSIS
cron
DESCRIPTION
Cron should be started from /etc/rc or /etc/rc.local. It will return immediately, so you don't need to start it with '&'.
Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory. Cron
also searches for /etc/crontab and the files in the /etc/cron.d/ directory, which are in a different format (see crontab(5)). Cron then
wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute. When execut-
ing commands, any output is mailed to the owner of the crontab (or to the user named in the MAILTO environment variable in the crontab, if
such exists).
Additionally, cron checks each minute to see if its spool directory's modtime (or the modtime on /etc/crontab) has changed, and if it has,
cron will then examine the modtime on all crontabs and reload those which have changed. Thus cron need not be restarted whenever a crontab
file is modified. Note that the Crontab(1) command updates the modtime of the spool directory whenever it changes a crontab.
SEE ALSO crontab(1), crontab(5)AUTHOR
Paul Vixie <paul@vix.com>
4th Berkeley Distribution 20 December 1993 CRON(8)