ssh

Keyboard shortcuts

Combo	Effect	Example
`Return` `~` `.`	Terminate session
`Return` `~` `~` `.`	Terminate session within another session
`Return` `~` `Ctrl`+`Z`	Background ssh
`Return` `~` `C`	Open command line (add/remove port forwardings)	Enter command line, then `-L 8443:localhost:443` `Return`
`Return` `~` `?`	Show all shortcuts

Options

Flag	Function	Example
`-A`	forward key to authenticate to other machines	`ssh -A $SERVER`
`-D`	dynamic port forwarding (SOCKS proxy)	`ssh -D 55555 $SERVER`
`-g`	allow remote hosts to connect to locally forwarded hosts	`ssh -g -L 8080:localhost:80 $SERVER`
`-i`	specify private key	`ssh -i alt-ed25519 $SERVER`
`-L`	forward remote port 80 to local port 8080	`ssh -L 8080:192.168.0.4:80 $SERVER`
`-N`	don't execute any command or shell on connection
`-t`	pseudo-terminal	`ssh -t $SERVER tmux attach`
`-R`	forward local port 80 to remote port 8080	`ssh -R 8080:localhost:80`
`-X`	enable X forwarding	`ssh -X $SERVERNAME`

Useful combinations of options

Example	Description
`ssh -f -N -L 8080:localhost:80 $SERVER`	forward remote port 80 without opening a shell (daemon-style)
`ssh -fMN $SERVER`	Create a master session without opening a shell (see below: `ControlMaster`

Client configuration (~/.ssh/config)

Host Matching

Pattern	Effect
`*`	match any host
`bob`	match “bob”
`192.168.0.1?`	match 192.168.0.10-19

Available Options

Option	Description
`Compression`	whether to use compression (-C)
`ControlMaster [auto]`	use a single TCP connection for all sessions to this host
`ControlPath [socket path]`	use this socket for the master session
`DynamicForward [port]`	dynamic forwarding (-D)
`ForwardAgent`	whether to use authentication forwarding (-a)
`ForwardX11`	always redirect X11 connections
`HostName`	actual address of the target machine
`IdentityFile`	use this key instead of the default file
`Port`	which port to connect to
`ProxyJump`	connect to this ssh server and connect to target machine from here
`StrictHostKeyChecking [no]`	(Don't) ask when host is not in known_hosts
`UseKeychain`	use Keychain to remember ssh passphrase (macOS only)
`User`

Example

Host *
	UseKeychain yes
 
Host server1-www
	HostName example.com
	User user
	Port 41234
	ControlMaster auto
	ControlPath ~/.ssh/cm_socket/%r@%h:%p
	IdentityFile ~/.ssh/private_id_ed25519
 
Host server2-www
	HostName inky
	User username
	ProxyJump server1-www
	IdentityFile ~/.ssh/private_id_ed25519

Wolfs KB

Table of Contents

ssh

Keyboard shortcuts

Options

Useful combinations of options

Client configuration (~/.ssh/config)

Host Matching

Available Options

Example