Update cheatsheets

tldr/linux/fincore

@@ -0,0 +1,17 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# fincore
+
+> Display how much cache memory a file is taking.
+> More information: <https://manned.org/fincore>.
+
+- Display cache details for a file:
+
+`fincore {{path/to/file}}`
+
+- Display all possible data columns:
+
+`fincore --output-all {{path/to/file}}`