LINUX COMMAND ATLAS · COMMAND GUIDE

Linux ssh command

Connect securely to a remote machine using its account and host name.

OpenSSH

Syntax

Command form

ssh [OPTION]... [USER@]HOST [COMMAND]

6 options

Option	What it does
`-p PORT`	Connect to PORT on the remote host.
`-i IDENTITY_FILE`	Use the specified private key file.
`-J DEST`	Connect through a jump host.
`-L [BIND:]PORT:HOST:HOSTPORT`	Forward a local port to a remote destination.
`-N`	Do not run a remote command; useful for forwarding only.
`-v`	Show verbose connection diagnostics; repeat for more detail.

3 examples

Connect securely to a remote machine using its account and host name.

ssh user@server.example

Open a remote shell as alice.

ssh alice@example.com

Connect on a custom port using a selected key.

ssh -p 2222 -i ~/.ssh/id_ed25519 alice@example.com

Verify host keys and protect private keys. SSH options may be set in ~/.ssh/config; avoid disabling host-key checks as a routine fix.