Update cheatsheets

tldr/linux/appman

@@ -0,0 +1,33 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# appman
+
+> Package manager for AppImages.
+> More information: <https://github.com/ivan-hc/AppMan>.
+
+- Update all packages to the latest available versions:
+
+`appman {{[-u|update]}}`
+
+- Search packages via keywords:
+
+`appman {{[-q|query]}} {{package}}`
+
+- Install a new package:
+
+`appman {{[-i|install]}} {{package}}`
+
+- Remove a package:
+
+`appman {{[-r|remove]}} {{package}}`
+
+- List all available packages:
+
+`appman {{[-l|list]}}`
+
+- Update AppMan to the latest version available:
+
+`appman {{[-s|sync]}}`

tldr/linux/resolvectl

@@ -7,6 +7,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 > Resolve domain names, IPv4 and IPv6 addresses, DNS resource records, and services.
 > Introspect and reconfigure the DNS resolver.
+> See also: `dig`, `nslookup`, `host`.
 > More information: <https://www.freedesktop.org/software/systemd/man/latest/resolvectl.html>.
 
 - Show DNS settings: