Move pages under tldr, lint run.sh, update docs

tldr/linux/apt-file

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# apt-file
+
+> Search for files in `apt` packages, including ones not yet installed.
+> More information: <https://manpages.debian.org/latest/apt-file/apt-file.1.html>.
+
+- Update the metadata database:
+
+`sudo apt update`
+
+- Search for packages that contain the specified file or path:
+
+`apt-file {{search|find}} {{partial_path/to/file}}`
+
+- List the contents of a specific package:
+
+`apt-file {{show|list}} {{package}}`
+
+- Search for packages that match the `regular_expression`:
+
+`apt-file {{search|find}} --regexp {{regular_expression}}`