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When it comes to managing and troubleshooting filesystems on Linux, understanding the underlying structure and data can be both crucial and complex. For Linux systems using ext2, ext3, or ext4 filesystems, debugfs is an incredibly powerful tool that allows administrators and enthusiasts to peek under the hood. This blog post explores how to use debugfs to inspect these filesystems, providing valuable insights into their operation and structure. debugfs is an interactive filesystem debugger for Linux that can be used to examine and debug Ext2, Ext3, and Ext4 filesystems. It is part of the e2fsprogs package, which generally comes pre-installed on most Linux distributions.