Update cheatsheets

nc

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# nc
+
+> A versatile utility for redirecting IO into a network stream.
+> More information: <https://manned.org/man/nc.1>.
+
+- Start a listener on the specified TCP port and send a file into it:
+
+`nc -l -p {{port}} < {{filename}}`
+
+- Connect to a target listener on the specified port and receive a file from it:
+
+`nc {{host}} {{port}} > {{received_filename}}`
+
+- Scan the open TCP ports of a specified host:
+
+`nc -v -z -w {{timeout_in_seconds}} {{host}} {{start_port}}-{{end_port}}`
+
+- Start a listener on the specified TCP port and provide your local shell access to the connected party (this is dangerous and can be abused):
+
+`nc -l -p {{port}} -e {{shell_executable}}`
+
+- Connect to a target listener and provide your local shell access to the remote party (this is dangerous and can be abused):
+
+`nc {{host}} {{port}} -e {{shell_executable}}`
+
+- Act as a proxy and forward data from a local TCP port to the given remote host:
+
+`nc -l -p {{local_port}} | nc {{host}} {{remote_port}}`
+
+- Send an HTTP GET request:
+
+`echo -e "GET / HTTP/1.1
+Host: {{host}}
+
+" | nc {{host}} 80`