Update cheatsheets

netperf

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# netperf
+
+> Client-side command for `netperf`, the benchmarking application that measures network throughput. Similar to `iperf`.
+> See also: `netserver`, for the server-side command.
+> More information: <https://hewlettpackard.github.io/netperf/doc/netperf.html#Global-Command_002dline-Options>.
+
+- Connect to server on a specific IP address via default port (12865):
+
+`netperf {{address}}`
+
+- Specify [p]ort:
+
+`netperf {{address}} -p {{port}}`
+
+- Specify the sampling [l]ength in seconds (default is 10):
+
+`netperf {{address}} -l {{seconds}}`
+
+- Force IPv[4] or IPv[6]:
+
+`netperf {{address}} -{{4|6}}`