How can I change file permissions recursively in Linux?

How can I change file permissions recursively in Linux?

You can use the chmod command with the -R option. For example: chmod -R 755 /path/to/directory.

What does the 755 mean in that command?

The 755 sets the permissions to read, write, and execute for the owner, and read and execute for the group and others.

Can I change permissions for specific file types only?

Yes, you can use the find command to target specific file types. For example: find /path/to/directory -type f -exec chmod 644 {} \;.

Is there a way to revert permissions back to their original state?

You would need to know the original permissions or use a backup. Unfortunately, there's no built-in way to revert permissions.