Update cheatsheets

linux/duc

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# duc
+
+> A collection of tools for indexing, inspecting and visualizing disk usage.
+> Duc maintains a database of accumulated sizes of directories in the file system, allowing to query this database, or creating fancy graphs to show where data is.
+> More information: <https://duc.zevv.nl/>.
+
+- 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 --classify --graph {{/usr/local}}`
+
+- List all files and directories under `/usr/local` using treeview recursively:
+
+`duc ls --classify --graph --recursive {{/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`