Update cheatsheets

linux/rkhunter

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rkhunter
+
+> Searches for rootkits and malware.
+> More information: <https://wiki.archlinux.org/title/Rkhunter>.
+
+- Check a system for rootkits and malware:
+
+`sudo rkhunter --check`
+
+- Update rkhunter:
+
+`sudo rkhunter --update`
+
+- Print all available tests:
+
+`sudo rkhunter --list`
+
+- Display version:
+
+`sudo rkhunter --versioncheck`
+
+- Display help:
+
+`sudo rkhunter --help`