Ssh HOST, for example ssh, is the most common SSH connection command. A “Permission denied” error message, password prompt or simply getting a Bash prompt with no output are sure signs that an SSH service is running. You could also try to connect to the local service by running ssh 127.0.0.1, but interpreting the results might actually be a bit harder. If you’re unsure whether you are running an SSH service you can check the output of ps ax | grep 'sshd' – it should list one or more processes if it’s running. This chapter looks into common use cases and pitfalls. If you administer any *nix host there’s a good chance it’s already running an SSH service. By far the most popular way to connect securely to other hosts from Bash is using the OpenSSH suite of tools.
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