George Lerner – Website Tech

For coaches who want to create and sell online courses, but struggle with the technical aspects

Linux Read-Only Folders

Remove Read-Only from Folder

To remove read-only permissions from a folder in Linux, follow these steps:

  1. Identify the Folder: Determine the path to the folder you wish to modify.
  2. Change Ownership: If necessary, change the ownership of the folder to your user account. Use the chown command:
    sudo chown -R $USER:$USER /path/to/folder
  3. Modify Permissions: Adjust the permissions of the folder and its contents to allow writing. Use the chmod command:
    sudo chmod -R u+w /path/to/folder
  4. Remove Immutable Attribute: If the folder has an immutable attribute set, you must remove it first. Use the chattr command:
    sudo chattr -i /path/to/folder
  5. Verify Changes: Ensure that the changes have taken effect by checking the folder’s permissions and attributes:
  6. ls -ld /path/to/folder lsattr /path/to/folder

These steps should allow you to modify a read-only folder in Linux. If the folder is on a read-only filesystem, you may need to remount the filesystem in read-write mode. (Look that up, beyond what this article is about.)

Linux Make a Folder Read-Only

To make a folder read-only in Linux, you can follow these steps:

  1. Change Permissions: Modify the folder’s permissions to remove write access for all users. Use the chmod command:
    sudo chmod -R a-w /path/to/folder
  1. Set Immutable Attribute: To ensure that the folder cannot be modified even by the root user, set the immutable attribute using the chattr command:
    sudo chattr +i /path/to/folder
  1. Verify Changes: Check the folder’s permissions and attributes to ensure they have been set correctly:
    ls -ld /path/to/folder
    lsattr /path/to/folder

Detailed Steps

  1. Change Permissions:
  • The chmod -R a-w /path/to/folder command removes write permissions for the owner, group, and others recursively for the folder and its contents.
  • -R flag ensures the change is applied recursively to all files and subdirectories within the folder.
  • a-w means “all users (owner, group, others) minus write permission.”
  1. Set Immutable Attribute:
  • The chattr +i /path/to/folder command sets the immutable attribute on the folder, which prevents any modifications, including deletion or renaming, even by the root user.
  • The +i flag adds the immutable attribute.
  1. Verify Changes:
  • ls -ld /path/to/folder displays the detailed permissions of the folder.
  • lsattr /path/to/folder shows the attributes of the folder, including the immutable attribute if set.

Example

# Change permissions to read-only
sudo chmod -R a-w /path/to/folder

# Set immutable attribute
sudo chattr +i /path/to/folder

# Verify changes
ls -ld /path/to/folder
lsattr /path/to/folder

By following these steps, you can effectively make a folder read-only in Linux, ensuring that it cannot be modified without explicitly removing the immutable attribute.