Why is my cron job running twice?

Re: Cron Job running twice Another thing to check is that there may be the same crontab entries for two different users.

Can two cron jobs run simultaneously?

Yes, cronjobs can run at the same time, and will do so if you set them up that way.

How do I troubleshoot cron jobs?

If you can’t find your job but believe it was previously scheduled double check that you are on the correct server.

  1. Validate your job schedule. Once you have found your job, verify that it’s scheduled correctly.
  2. Check your permissions.
  3. Check that your cron job is running by finding the attempted execution in syslog.

How do I know if cron is running in Solaris?

To check to see if the cron daemon is running, search the running processes with the ps command. The cron daemon’s command will show up in the output as crond. The entry in this output for grep crond can be ignored but the other entry for crond can be seen running as root. This shows that the cron daemon is running.

How do I stop a cron job run twice?

There are two main approaches:

  1. make the script exit if it detects another instance of itself running.
  2. Use a lock file and exit the script if the file exists: #!/bin/bash if [ -e “/tmp/i.am.running” ]; then echo “Another instance of the script is running.

How do I create multiple cron jobs?

FACT: you can run as many cron jobs from a single crontab file as you wish. FACT: you can also run different jobs as different users, each with their own crontab file. SUGGESTION: 1) Just debug what’s wrong with your second job.

How do I know if a cron job has failed?

Alternate ways According to this answer one can get errors of a cronjob in a log file using redirection. But you need to set the redirection with your cron job and specify the log file by yourself. And the /var/log/syslog file is always there to check if your cron job is running as you expected or not.

Why is crontab not working?

The reason is that cron does not have the same PATH environment variable as the user. If your crontab command has a % symbol in it, cron tries to interpret it. So if you were using any command with a % in it (such as a format specification to the date command) you will need to escape it.

Does crontab run automatically?

The Cron daemon is a built-in Linux utility that runs processes on your system at a scheduled time. Cron reads the crontab (cron tables) for predefined commands and scripts. By using a specific syntax, you can configure a cron job to schedule scripts or other commands to run automatically.

Will cron start a new job if the current job is not complete?

The script should also update record in db – something like every 5 mins – I am still running. When new job is started, it should check if all previous tasks are finished or last update was more then then minutes (?) ago, if yes then run, no then exit.

Where is cron lock file?

2 Answers. The lock file you specify as the option to /usr/bin/flock ; /var/cron. lock remains locked with the flock(2) system call for the duration of your script /usr/bin/myscript . Once your script completes that lock is again released by /usr/bin/flock .


Why does crontab run twice in cron job?

For sure it’s not the crontab entry that’s causing it to run twice. The fastest way to find out what is going on is to add some debugging to the cron job script.

How to check Cron service status in Solaris 10?

In case of Solaris 10, check the for the cron service status : To make sure cron jobs are running properly, add below entry in the crontab. This will print the date every minute to the console. You can also use pts terminal you are working on, if you don’t have the access to console.

How does a crontab file work in Solaris?

A crontab file consists of commands, one command per line, that execute automatically at the time specified by the first five fields of each command line. These five fields, described in the following table, are separated by spaces.

Where to find Cron files in Solaris spool?

Users can submit cron jobs by adding an entry to their respective crontabs located in /var/spool/cron/crontabs directory and stored as their login name. Below are few of the troubleshooting tips and best practices which can be helpful in many cases. The important files related cron are : Directory containing individual crontab files of all users.


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