Linux chattr permissions explained in detail

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Permission management-3.1 file system attributes chattr permissions

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1. Chattr command format

• chattr [+-=] [options] [file or directory name]

  • +: Increase permissions

  • -: Delete permission

  • =: Equal to a certain authority

• Option i

  • For files: It is not allowed to delete or rename files, nor add or modify data

  • For directories: only the data of the files in the directory can be modified, but it is not allowed to create and delete files

  • The i attribute is equivalent to being locked and can only be seen, and is also restricted to root

• Option a

  • For files: data can only be added to the file, but the data cannot be deleted or modified

  • For directories: only files created and modified in the directory are allowed, but deletion is not allowed

2. View file system properties

• lsattr [options] [file name]

  • -a: display all files and directories

  • -d: If the target is a directory, only the attributes of the directory itself are listed instead of the sub-files

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