How to change directory permissions using chmod in Linux?

In Linux, you can use the chmod command to change the permissions of a directory.

To change directory permissions, you can use the following command:

chmod [选项] 权限 目录名

The options can be one or more of the following:

  1. – R: Recursively change the permissions of a directory and its subdirectories.
  2. -v: display detailed modification information
  3. -c: Display only the files/directories that have been modified.
  4. -f: prohibit displaying warning messages

Permissions can be in one of the following formats:

  1. Numeric form: Using 3 or 4-digit numbers to represent permissions, corresponding to the permissions of the owner, group, and other users. Each permission digit is represented by a number: read permission is 4, write permission is 2, execute permission is 1, and no permission is 0. For example, 755 means the owner has read, write, and execute permissions, while the group and other users only have read and execute permissions.
  2. Symbolic forms: use u, g, o, and a to represent owner, group, other users, and all users respectively. Use +r, -r, +w, -w, +x, -x to indicate read, write, and execute permissions. For example, u+rwx signifies adding read, write, and execute permissions for the owner.

Here are some examples:

  1. Set the owner of the directory to have read, write, and execute permissions, while the group and other users only have read and execute permissions.
chmod 755 /directory
  1. Change the permissions of the directory and its subdirectories so that the owner has read, write, and execute permissions, while the group and other users have only read permissions.
chmod -R 744 /directory
  1. Remove the execute permissions for the owner and group of the directory.
chmod g-x /directory

Please proceed with caution when changing directory permissions to avoid compromising the system’s security.

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