I recently decided to replace the SD card in my Raspberry Pi and reinstall the system. Without any special backups in place, I turned to rsync to duplicate /var/lib/docker with all my containers, including Nextcloud.
Step #1: I mounted an external hard drive to /mnt/temp.
Step #2: I used rsync to copy the data to /mnt/tmp. See the difference?
Step #3: I reformatted the SD card.
Step #4: I realized my mistake.
Moral: no one is immune to their own stupidity 😂
Sorry to hear, I feel you:
I wanted to delete all .m3u-files in my music collection when I learned:
find ./ -name "*.m3u" -delete-> this would have been the right way, all .m3u in the current folder would have been deleted.find ./ -delete -name "*.m3u" -> WRONG, this just deletes the current folder and everything in it.Who would have known, that the position of -delete actually matters.
I didn’t know there was a -delete option to find! I’ve been piping to xargs -0 for decades!
Probably because it’s easier to fuck up. With piping to xargs, you are forced to put the delete command last.
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I did this sort of mistakes too, luckily BTRFS snapshots are always here to save the day !
The first one would have deleted nothing as it needs to match the whole name. I recommend running find with an explicit -print before replacing it in place with -delete or -exec. It’s good to remember that find has a complex order dependent language with -or and -and, but not maybe the best idea to try to use those features.
Lemmy interpreted the
*as something cursive. I try to edit it like I mean it.fd -tf -e m3u -x rmloads all cores and nothing works fasterI can recommend fd to everyone frustrated with find, it has a much more intuitive interface imo, and it’s also significantly faster.
I use GNU find every day and still have to google about the details. Only learnt about - delete the other day, good to know the position matters.