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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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Can't get crontab to run backup script properly (lemmy.world)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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Hello everyone!

I'm running a few different services off of my Ubuntu VM on ProxMox, and they've all been running great for about 6 months now. However, I'm trying to setup some better backups and such of individual services, and I wrote a bash script to do that for me and delete older backups once I accumulate enough.

All of that works 100% fine. Like absolutely no issues with the script when I run it myself. However, I can not for the life of me get crontab to run it.

If I run sudo ./folder/directory/backup.sh then everything runs perfectly. However, if I setup my crontab with 0 * * * * ./folder/directory/backup.sh I get absolutely nothing.

I have also tried setting the crontab with sudo, sh, sudo sh, and both combinations without the dot in front of the path to the shell script.

Does anyone have any idea what I am doing wrong?

Thank you so much for any help

Update: I have edited /etc/crontab with the following 0 * * * * * root /mnt/nas/freshrss/backups/backup.sh. After waiting for the crontab to fire off, nothing happened. Still not really sure what's going on.

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[–] [email protected] 6 points 1 year ago

The crontab has no concept of . meaning the current directory.

Not quite true. . exists in all directories so will work in any application. But it raises the question of what is the directory cron is running in. Probably not what you expect, definitely not your users home dir and you probably should not rely on it. So you should not use relative paths inside it - even if you can get them to work. Best to just stick to absolute paths or explicit cd to the right location before hand (that is on the same cron line or in the script it calls).