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I wrote a small script to handle my zfs backups. When i run it by hand, it works well:

/root/bin/zfs-backup -k 7 -p zfs-auto-snap_daily -r vm/containers tank/backups

But running it in cron like so, throws an error "The file system 'vm/containers' doesn't exists."

30 0 * * * root /root/bin/zfs-backup -k 7 -p zfs-auto-snap_daily -r vm/containers tank/backups
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It was all about zfs not being found because of the limited PATH in crontabs (/usr/bin:/bin), I added the full path to zfs in my script (/sbin/zfs) and it now works.

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    Whenever something works in a regular shell but not through cron, always always always verify your environment. Odds are pretty good that that's where your problem is. – a CVn Nov 4 '16 at 21:51

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