Update cheatsheets

tldr/tspin

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# tspin
+
+> A log file highlighter based on the `less` pager and basically behaves like any pager.
+> More information: <https://github.com/bensadeh/tailspin>.
+
+- Read from file and view in `less`:
+
+`tspin {{path/to/application.log}}`
+
+- Read from another command and print to stdout:
+
+`journalctl -b --follow | tspin`
+
+- Read from file and print to `stdout`:
+
+`tspin {{path/to/application.log}} --print`
+
+- Read from stdin and print to `stdout`:
+
+`echo "2021-01-01 12:00:00 [INFO] This is a log message" | tspin`