feat(ssh): add ssh notes

docs/misc/ssh.md

@@ -0,0 +1,45 @@
+# SSH
+
+`ssh` is a program for logging into a remote machine and for executing commands on a remote machine. It is intended to provide secure encrypted communications between two untrusted hosts over an insecure network.
+
+## Basics
+
+```sh
+ssh user@destination <command> # exec <command> in remote machine ($SHELL if omitted)
+ssh user@destination -i <path/to/private-key>  # use key for auth
+ssh user@destination -f  # exec ssh in the background
+ssh user@destination -N  # do not send commands to the server (do not start $SHELL)
+ssh user@destination -g  # allow remote hosts to connect to local forwarded ports
+ssh user@destination -t  # force pseudo-tty emulation
+```
+
+> **Note**: use `~` while connected to use the "ssh console".
+
+### Jump-Hosts
+
+Connect to the final destination jumping through the specifies other destinations.
+
+```sh
+ssh -J user_1@destination_1,user_2@destination_2 user@final_destination
+```
+
+## Port Forwarding
+
+![ssh-tunnels](https://iximiuz.com/ssh-tunnels/ssh-tunnels.png "SSH Tunnels Cheat Sheet By Ivan Velichko")
+
+### Local Port Forwarding
+
+Start listening on `local_address:local_port` and forward any traffic to `remote_address:remote_port`.
+
+```sh
+ssh -N -f -L local_address:local_port:remote_address:remote_port user@destination
+ssh -N -f -L local_port:remote_address:remote_port user@destination  # local_address defaults to localhost
+```
+
+### Remote Port Forwarding
+
+Start listening on `remote_address:remote_port` and forward any traffic to `local_address:local_port`.
+
+```sh
+ssh -N -f -R remote_address:remote_port:local_address:local_port user@destination
+```

mkdocs.yml

@@ -182,4 +182,5 @@ nav:
   - Misc:
     - Git: misc/git.md
     - GraphQL: misc/graph-ql.md
-    - RegEx: misc/regular-expressions.md
+    - RegEx: misc/regular-expressions.md
+    - SSH: misc/ssh.md