Update cheatsheets

linux/vnstat

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# vnstat
+
+> A console-based network traffic monitor.
+> More information: <https://manned.org/vnstat>.
+
+- Display traffic summary for all interfaces:
+
+`vnstat`
+
+- Display traffic summary for a specific network interface:
+
+`vnstat -i {{eth0}}`
+
+- Display live stats for a specific network interface:
+
+`vnstat -l -i {{eth0}}`
+
+- Show traffic statistics on an hourly basis for the last 24 hours using a bar graph:
+
+`vnstat -hg`
+
+- Measure and show average traffic for 30 seconds:
+
+`vnstat -tr {{30}}`