The article directories

  • 1. Basic introduction to Linux groups
  • 2. File/directory owner
    • 2.1 Viewing the File Owner
    • 2.2 Changing the File Owner
  • 3. Create a group
    • 3.1 Basic Instructions
  • 4. Group where the file or directory resides
    • 4.1 Viewing the Group where a File or Directory Resides
    • 4.2 Modifying the Group where a File or Directory Resides
  • 5. Other groups
  • 6. Change the user group
    • 6.1 Changing a User Group

1. Basic introduction to Linux groups

Each user in Linux must belong to a group and cannot be independent of the group. In Linux each file has a concept of owner, group, and other groups.

  1. The owner of the
  2. Where the group
  3. Other groups
  4. Change the user group

2. File/directory owner

  • The creator of the file, who created the file, is the natural owner of the file.

2.1 Viewing the File Owner

  • Instructions:ls -ahl
  • Examples of application

2.2 Changing the File Owner

  • Instructions:Chown User name Name of the file
  • The application case
  • Requirements: UserootCreate a fileapple.txtAnd then change its owner totom(If the Tom user is created)
chown tom apple.txt
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3. Create a group

3.1 Basic Instructions

  • Groupadd group name
  • Examples of application
  1. Create a group,monster
groupadd monster
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  1. Create a userfoxAnd put it intomonsterIn the group
useradd -g monster fox
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4. Group where the file or directory resides

  • When a user creates a file, the group that the file belongs to is the group that the user belongs to (default).

4.1 Viewing the Group where a File or Directory Resides

  • Basic instructions:The ls - ahl
  • For example, usefoxTo create a file, see which group the file belongs to?

    First switch to the Fox user:su fox

4.2 Modifying the Group where a File or Directory Resides

  • Basic instructions:CHGRP Group name File name
  • Application examples:

    Create a file as user rootorange.txt, see which group the file belongs to, and then change the group tofruitGroup.
  1. groupadd fruit
  2. touch orange.txt
  3. See which group this file belongs to ->root 组
  4. chgrp fruit

5. Other groups

  • All users of the system are other groups of the file except the owner of the file and the users of the group

6. Change the user group

  • When adding a user, you can specify the group to which the user is to be added. You can also change the group of a user by using the root management permission.

6.1 Changing a User Group

  1. Usermod -g New group name User name
  2. Usermod -d Directory name User nameChange the initial directory in which the user logs in. Special note: the user needs to have access to the new directory.
  • Examples of application

    将 xdr630This user is changed from the original group towudang 组
usermod -g wudang xdr630
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