Update cheatsheets

linux/lnav

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# lnav
+
+> Advanced log file viewer to analyze logs with little to no setup.
+> More information: <https://docs.lnav.org/en/latest/cli.html>.
+
+- View logs of a program, specifying log files, directories or URLs:
+
+`lnav {{path/to/log_or_directory|url}}`
+
+- View logs of a specific remote host (SSH passwordless login required):
+
+`lnav {{ssh}} {{user}}@{{host1.example.com}}:{{/var/log/syslog.log}}`
+
+- Validate the format of log files against the configuration and report any errors:
+
+`lnav -C {{path/to/log_directory}}`