Sounds like you might be asking for the <B>fsck ( )</B> command. On linux systems using the ext2 file system it is <B>e2fsck ( )</B>. These commands are used to repair broken file systems.

Your question is somewhat fuzzy, so this reply is just a wild guess based on your use of the term 'gaps' relative to the filesystem. Sounds like you are seeking a utility to repair the file system, like <B>fsck</B> ?