课程: Ubuntu Linux: Essential Commands
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File permissions
- [Instructor] On a multi-user system, - [Instructor] On a multi user system, we need a way we need a way of keeping users files of keeping users files and system files secure from and systems files secure from unauthorized viewing and modification. To do that, Linux has a system of permissions that divide access to files up in to a few categories. access to files up into a few catetories. They define what users and groups of users can do with They define what users and groups of users can do with a file a file and what kind of actions are allowed by each group. and what kind of actions are allowed by each group. As we can see when we list the files in a directory, As we can see when we list the files in a directory, there's a row of characters for each file. there's a row of characters for each file. This row is divided up into a few sections. This row is divided up into a few sections. After the initial character, After the initial character which represents the type which…
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