What does the command 'restorecon' do?

The command 'restorecon' is utilized primarily in the context of SELinux (Security-Enhanced Linux). Its main function is to change a file's security context back to the default context as defined by the security policy in effect. This command is particularly useful in scenarios where files may have had their SELinux contexts altered due to various reasons, such as manual modifications, transfer from different systems, or errors during system updates.

When executed, 'restorecon' will apply the correct security labels to files and directories as per their current type definitions in the SELinux policy, ensuring they have the proper context for the enforcement level specified. The consistent application of these contexts is crucial for maintaining the security and integrity of the system, helping to prevent unauthorized access or privilege escalation.

Others, such as setting boolean policies or disabling security profiles, serve different purposes within the SELinux configuration. Displaying security contexts is also a separate action that allows users to see the existing security labels, but it does not modify them. These functions are vital for managing security in a Linux environment, but they do not relate directly to restoring the default security contexts applied by 'restorecon'.