Why are my crontab scripts not being executed?

Why are my crontab scripts not being executed?

Often, crontab scripts are not executed on schedule or as expected. There are numerous reasons for that: This community wiki aims to aggregate the top reasons for crontab scripts not being executed as expected. Write each reason in a separate answer.

Why is CRON not running my sh script?

It’s not really working, but the echo to the logfile, is being logged. So crontab should be up and running. I’ve tried the * * * * * sh pushCheck.sh too, but it doesn’t seem to work and I’m out of ideas.

Where can I find the bash script for crontab?

I have the following bash script: which is located in /home/srvlinux01/MySQLBackups/ as backup.sh with the following permissions I’ve set up a cronjob on sudo crontab -e to run it every day, at night

Why does CRON not work when executed from shell?

This is especially tricky, because the same command will work when executed from shell. 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.

What’s the difference between a cron and a crontab file?

The cron job specification format differs between users’ crontab files (/var/spool/cron/username or /var/spool/cron/crontabs/username) and the system crontabs ( /etc/crontab and the the files in /etc/cron.d ). The system crontabs have an extra field ‘user’ right before the command-to-run.

Why is Cron calling scripts that are not executable?

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. Cron is calling a script that is not executable.

Why are my cron jobs not working in Ubuntu?

Cron jobs won’t run if your user’s password has expired. One indication of this is if your cron log (typically /var/log/syslog on Ubuntu, I believe) contains messages like “Authentication token is no longer valid; new one required”. You can check for this problem by running sudo chage -l the_username. Here’s an example of an expired password:

Why is CRON not allowed to run systemctl?

So, if your problem is because cron is not allowed to run systemctl because you are already logged in, you might be able to get around that by playing with polkit but I have no experience there so I can’t help. An easy workaround is to use root’s crontab instead of your own.

How to write Sudo systemctl hibernate Fron Cron?

After this, you can write sudo systemctl hibernate fron cron to hibernate. Note: Directly modifying /etc/sudoers is bad ; instead make a custom sudoers file under /etc/sudoers.d/ using the command – sudo visudo -f /etc/sudoers.d/custom.

What are the permissions in / etc / crontab?

/etc/crontab permissions. The /etc/crontab file has the permissions: I understand that this file is for system cron jobs and other users should not have permission to modify it. The current permissions allows all users read access to the file, enabling them to view the contents.

Is there a benefit to not reading / etc / crontab?

This would be security by obscurity. There is no real benefit by preventing normal users from reading /etc/crontab. Even if a user can’t read the file, it’s still possible to gather the executed command just by regularly capturing the process list with ps or by reading /proc.

Where is the username in a crontab file?

A user formatted crontab does not include a username in the 6th position of a row, while a system formatted crontab includes the username and runs the command as that user. Ensure the file has execute permissions.

Why does CRON not execute my bash script?

My script works when I run it in bash. It also works if I specify exactly the path and filename in the cron. The problem occurs when I ask cron to run my script. It seems to me cron cannot run the subprocess to create the filename based on the date. my script is as follow:

How to schedule a cron script to run every night?

Closed last year. I have created a simple executable script to move a file for me, as the name of the file is the date on each day, the script creates the file name and then moves the file. I want to schedule it to run every night using cron.

Why is cron job not running with same user?

The cron job doesn’t run with the same user with which you are executing the script manually – so it doesn’t have access to the same $PATH variable as your user which means it can’t locate the Java executable to execute the commands in the script. We should first fetch the value of PATH variable as below and then set it (export) in the script –