I have a script defined in Cron which runs every 1 minute.
Now the issue is executing that myscript.sh sometime will take 2/3 or more minutes to finish execution.
But after 1 minute cron will invoke another instance(process) execute the myscript. In that case do you think there is a probability to overlapping the instance and may create problem.
If there is a chance for overlapping may be the below shellscript(run it in background) is okay which will run every 1 minute. Script will invoke different instant after every minute.
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 BSD
cron
CRON(8) System Manager's Manual CRON(8)NAME
cron - clock daemon
SYNOPSIS
/usr/sbin/cron
DESCRIPTION
Cron executes commands at specified dates and times according to the instructions in the files /etc/crontab and /etc/crontab.local. None,
either one, or both of these files may be present. Since cron never exits, it should only be executed once. This is best done by running
cron from the initialization process through the file /etc/rc; see init(8).
The crontab files consist of lines of seven fields each. The fields are separated by spaces or tabs. The first five are integer patterns
to specify:
o minute (0-59)
o hour (0-23)
o day of the month (1-31)
o month of the year (1-12)
o day of the week (1-7 with 1 = Monday)
Each of these patterns may contain:
o a number in the range above
o two numbers separated by a minus meaning a range inclusive
o a list of numbers separated by commas meaning any of the numbers
o an asterisk meaning all legal values
The sixth field is a user name: the command will be run with that user's uid and permissions. The seventh field consists of all the text
on a line following the sixth field, including spaces and tabs; this text is treated as a command which is executed by the Shell at the
specified times. A percent character (``%'') in this field is translated to a new-line character.
Both crontab files are checked by cron every minute, on the minute.
FILES
/etc/crontab
/etc/crontab.local
7th Edition October 23, 1996 CRON(8)