# duc > A collection of tools for indexing, inspecting, and visualizing disk usage. > Duc maintains a database of accumulated sizes of directories of the file system, allowing queries in this database, or creating fancy graphs to show where data is. > More information: . - Index the /usr directory, writing to the default database location ~/.duc.db: `duc index {{/usr}}` - List all files and directories under /usr/local, showing relative file sizes in a [g]raph: `duc ls -Fg {{/usr/local}}` - List all files and directories under /usr/local using treeview recursively: `duc ls -Fg -R {{/usr/local}}` - Start the graphical interface to explore the file system using sunburst graphs: `duc gui {{/usr}}` - Run the ncurses console interface to explore the file system: `duc ui {{/usr}}` - Dump database info: `duc info`