Explains how to get the inode usage count and the number of free inodes on a Linux system. Also covers how to find inode number of a file and search for a file using a inode number.
Explains how to make a file undeletable or immutable on Linux using extended file attributes. Even a root user will not be able to delete a file with the immutable attribute set.
Objective: Get the last time the ext2/ext3/ext4 filesystem was checked on Linux using e2fsck (a tool to check and repair a Linux ext2/ext3/ext4 file system).