Clockwork sh "mycommand" tells sh to run mycommand as a script file. Did you mean sh -c "mycommand"? At any rate, this answer seems to be about making the command run in bash specifically, so why did you add the command for sh here? Olorin From my understanding, the objective of the first point was to try and run it with sh, to see if the problem truly came from the fact that cron is running it with sh instead of bash.
Then again, I have little knowledge about the matter, so I might be wrong. The solution was to restart cron: sudo service cron restart.
Yes, after changing the timezone on a system, one must either restart every service that cares about what time it is, or reboot. I prefer the reboot, to be sure I've caught everything. Oh for God's sake, killed hours on this. Adam Matan. This is what has been causing my Cron job to fail for the last week. Finally figured out that my Date didn't have an escape character backslash for any other folks looking for what the escape character is.
See also How can I execute date inside of a cron tab job? Cron is calling a script that is not executable. If you're used to executing scripts with.
Do I have to install something or just restart one of the two? Example: Firefox launch with cron. First I figured it out myself and then I found your answer! Still thanks a lot! Permissions problems are quite common, I'm afraid. Note that if you have a crontab line that is set to pipe output to a file that does not yet exist, and the directory for the file is one that the cron user doesn't have access to, then the line will not execute.
If the script being invoked from cron is written in an interpreted language like PHP, you may need to set the working directory in the script itself. Just got caught with this one: the script used to be in the root of my home directory, but then I moved it and updated the crontab and couldn't figure out why it wasn't working.
Turns out the script was using a relative path, assuming that it was relative to the location of the script but it was in fact relative to the root of my home directory because that was the working directory that cron was using, which is why the script worked when it was in the root of my home directory because the script's expected working directory and it's actual working just happened to coincide.
The system crontabs have an extra field 'user' right before the command-to-run. This is reloaded daily from a crontab entry like:! This covers three separate problems.
Can they be split into separate answers? Corrected now. I just spent a good while wondering why a cronjob that I was trying to test every minute in my current hour was not working Easy fix to remove the 'v':! Why is this causing a failure? Buffer issues? Any outputs or errors trriggred via cron jobs is gooing to sent to your mailbox. My two gotchas: mycronjob file had to be owned by root to run I had to set permissions of the file to - would not run.
How can this be debugged? Reviewing cron's error log is the most common way. IIRC 'crontab -e' does a syntax parse after you've edited the file as well - but that might not be universal.
Cron daemon could be running, but not actually working. Cron is insanely robust. I'm not sure but I think this did actually just happen to me. I tried pidof cron and got nothing.
Tried using service utility and it said cron was already running. Just ran this command and ran pidof again and I get a result. I haven't had time to pull apart the cron code and check why this works, just a detail I've noticed. Yeah, that was my first thought when writing the afore-mentioneed script. I forget why I didn't use that, possibly some non-standard behavior that circumvented said solution. Martijn de Milliano. In my case cron and crontab had different owners. The latter is not recommended.
Cron is already installed as a service under account LocalSystem. Do you want to remove or reinstall it? The cron service was removed. Do you want to install the cron daemon as a service? If you are the only user on this machine, the daemon can run as yourself. This gives access to all network drives but only allows you as user. To run multiple users, cron must change user context without knowing the passwords.
Otherwise you need to have or to create a privileged account. This script will help you do so. Do you want the cron daemon to run as yourself? Do you want to use another privileged account name? Checking its privileges. INFO: User is a valid privileged account. You might need to restart the cron service for it to pick up the changes you made. You can do that with sudo service cron restart. You can check the cron logs to make sure that the crontab is working correctly.
And running the following grep command will get you all the cron logs. Even if the job is logged there, any errors won't show up there. So it's helpful to log those separately. You're bound to thank me later ;. A related, but distinct problem is to interact in any meaningful way with the user. If you can identify the user's active session to the extent that this is even well-defined in the first place , how do you grab their attention without interfering with whatever else they are in the middle of?
But more fundamentally, how do you even find them? If they are not logged in at all, what do you do then? If they are, how do you determine that they are active and available? If they are logged in more than once, which terminal are they using, and is it safe to interrupt that session?
Similarly, if they are logged in to the GUI, they might miss a window you spring up on the local console, if they are actually logged in remotely via VNC or a remote X11 server,. As a further aside: On dedicated servers web hosting services, supercomputing clusters, etc you might even be breaking the terms of service of the hosting company or institution if you install an interactive graphical desktop you can connect to from the outside world. Another is poorly designed scientific or office software which was not written for batch use, and thus requires a GUI even when you just want to run a batch job and then immediately quit without any actual need to display anything anywhere.
In the latter case, probably review the documentation to check if there isn't a --batch or --noninteractive or --headless or --script or --eval option or similar to run the tool without the GUI, or perhaps a separate utility for noninteractive use. The absolutely simplest is to set up the system to automatically log in a specific user at startup without a password prompt, and configure that user's desktop environment Gnome or KDE or XFCE or what have you to run your script from its "Startup Items" or "Login Actions" or "Autostart" or whatever the facility might be called.
If you need more control over the environment, maybe run bare X11 without a desktop environment or window manager at all, and just run your script instead. Or in some cases, maybe replace the X11 login manager "greeter" with something custom built. Copying my answer for a duplicated question here. Another solution would be to specify an interpreter in the script file, make it executable, and call the script itself in your crontab:.
Sometimes the command that cron needs to run is in a directory where cron has no access, typically on systems where users' home directories' permissions are and the command is in that directory. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. CronJob not running Ask Question. Asked 7 years, 7 months ago.
Active 2 months ago. Viewed k times. Improve this question. Gopal Chitalia 2 2 silver badges 16 16 bronze badges. You should specify the path in full to avoid that dependency. Add a comment.
Active Oldest Votes. My cronjob doesn't run?! Here's a checklist guide to debug not running cronjobs: Is the Cron daemon running? Run ps ax grep cron and look for cron. Debian: service cron start or service cron restart Is cron working? See below. You obviously need to have write access to the file you are redirecting the output to.
The script you are trying to execute with Crontab might not be executable, i. The path of the script that you are trying to execute might be incorrect. You might be missing out on the extension of the file that you are trying to execute with Crontab. Depending upon the actual cause of the Crontab failure, there are different ways to perform troubleshooting.
Some of these ways are listed below:. First, you need to ensure that the Cron daemon is active and running in the background. This can be done simply by checking its status with the following command:.
Check the path of the command or the file that you are trying to execute with Crontab and ensure if it is correct.
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