Access to files by users are controlled by file permissions . The Linux file permissions system is simple but flexible, which makes it easy to understand and apply, yet able to handle most normal permission cases easily. Files have just three categories of user to which permissions apply. The file is owned by a user , normally the one who created the file. The file is also owned by a single group , usually the primary group of the user who created the file, but this can be changed. Different permissions can be set for the owning user, the owning group, and for all other users on the system that are not the user or a member of the owning group. The most specific permissions apply. So, user permissions override group permissions, which override other permissions. In the graphic that follows, joshua is a member of the groups joshua and web, while allison is a member of allison, wheel, and web. Whe...
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