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+# dpkg-query
+
+> A tool that shows information about installed packages.
+
+- List all installed packages.
+
+`dpkg-query -l`
+
+- List installed packages matching a pattern.
+
+`dpkg-query -l '{{pattern}}'`
+
+- List all files installed by a package.
+
+`dpkg-query -L {{package_name}}`
+
+- Show information about a package.
+
+`dpkg-query -s {{package_name}}`