LTS

    Innovation Version

      Appendix

      This chapter describes the file permissions and umask values.

      Permissions on Files and Directories

      Permission on files and directories in Linux specifies the users who can access and perform operations on files and directories and the access and operation modes. Permissions on files and directories include read only, write only, and execute.

      The following types of users can access files and directories:

      • File creator
      • Users in the same group as a file creator
      • Users not in the same group as a file creator

      An example of permission on files and directories is described as follows:

      If the permission on /usr/src is set to 755 which is 111101101 in binary mode, permissions for each type of users are described as follows:

      • The left-most 111 indicates that the file owner can read, write, and execute the file.
      • The middle 101 indicates the group users can read and execute but cannot write the file.
      • The right-most 101 indicates that other users can read and execute but cannot write the file.

      umask Values

      When a user creates a file or directory, the file or directory has a default permission. The default permission is specified by the umask value.

      The umask value is the complement of the permission value. The actual permission value is obtained by subtracting the umask value from the default maximum permission value. The default maximum permission of a file is readable and writable. The default maximum permission of a directory is readable, writable, and executable. The default permission of a file is 666 minus the umask value. The default permission of a directory is 777 minus the umask value.

      Bug Catching

      Buggy Content

      Bug Description

      Submit As Issue

      It's a little complicated....

      I'd like to ask someone.

      PR

      Just a small problem.

      I can fix it online!

      Bug Type
      Specifications and Common Mistakes

      ● Misspellings or punctuation mistakes;

      ● Incorrect links, empty cells, or wrong formats;

      ● Chinese characters in English context;

      ● Minor inconsistencies between the UI and descriptions;

      ● Low writing fluency that does not affect understanding;

      ● Incorrect version numbers, including software package names and version numbers on the UI.

      Usability

      ● Incorrect or missing key steps;

      ● Missing prerequisites or precautions;

      ● Ambiguous figures, tables, or texts;

      ● Unclear logic, such as missing classifications, items, and steps.

      Correctness

      ● Technical principles, function descriptions, or specifications inconsistent with those of the software;

      ● Incorrect schematic or architecture diagrams;

      ● Incorrect commands or command parameters;

      ● Incorrect code;

      ● Commands inconsistent with the functions;

      ● Wrong screenshots.

      Risk Warnings

      ● Lack of risk warnings for operations that may damage the system or important data.

      Content Compliance

      ● Contents that may violate applicable laws and regulations or geo-cultural context-sensitive words and expressions;

      ● Copyright infringement.

      How satisfied are you with this document

      Not satisfied at all
      Very satisfied
      Submit
      Click to create an issue. An issue template will be automatically generated based on your feedback.
      Bug Catching
      编组 3备份