Update cheatsheets

tldr/linux/pacreport

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pacreport
+
+> Generate a report of installed packages.
+> More information: <https://github.com/andrewgregory/pacutils/blob/master/doc/pacreport.pod>.
+
+- Generate a summary of installed packages:
+
+`pacreport`
+
+- List unowned files:
+
+`pacreport --unowned-files`
+
+- List missing package files:
+
+`pacreport --missing-files`
+
+- Search for unmerged backup files (i.e. `.pacnew`, `.pacsave`) in `/etc`:
+
+`pacreport --backups`
+
+- Display packages in a specific group that are not currently installed:
+
+`pacreport --group {{group_name}}`