Then spend at least 5 more minutes testing to validate what you've learned.Īfter that, you can learn how to setup directories to allow groups of userids to work together. Just do it until the "light bulb" moment happens. Then you'll need 30-45 minutes of trying stuff out with 3 terminals, 3 userids, 2 groups - try every possible combination of permissions, groups on files and directories. This needs to be hands-on, not just reading. is an overview of Unix/POSIX permissions. The required access for the specific accounts to access what they need, but no more, is the goal - always. Of course, there is a short answer - but it completely throws security away and I will not do that. OTOH, native Linux file systems let us use the full POSIX Unix permissions which means we have controls to allow lots of different userids to work together on the same files, directories, and once setup, can forget about this. If it isn't, then the only way to set permissions is at mount time, through mount options. Run df -Th -x squashfs -x tmpfs -x devtmpfs - post the results. If you are mounting it through clicking on some GUI, then it is highly likely not to be a "real" mount.Ĭonnect and access the drive. Which file system is used will determine the next steps. This is a very common issue for people who don't understand Unix permissions.Īlso, external devices can have all sorts of file systems.
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