Update cheatsheets

socat

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# socat
+
+> Multipurpose relay (SOcket CAT).
+> More information: <http://www.dest-unreach.org/socat/>.
+
+- Listen to a port, wait for an incoming connection and transfer data to STDIO:
+
+`socat - TCP-LISTEN:8080,fork`
+
+- Listen on a port using SSL and print to STDOUT:
+
+`socat OPENSSL-LISTEN:4433,reuseaddr,cert=./cert.pem,cafile=./ca.cert.pem,key=./key.pem,verify=0 STDOUT`
+
+- Create a connection to a host and port, transfer data in STDIO to connected host:
+
+`socat - TCP4:www.example.com:80`
+
+- Forward incoming data of a local port to another host and port:
+
+`socat TCP-LISTEN:80,fork TCP4:www.example.com:80`