SSH in a script? Use `-o BatchMode=yes` or it'll hang | Scribbles for my memory

SSH in a script? Use `-o BatchMode=yes` or it'll hang

When SSH runs in a script and the key isn't set up, it prompts for a password — and your script hangs forever. BatchMode=yes disables all interactive prompts (password, passphrase, host key confirmation) and fails immediately instead.

ssh -o BatchMode=yes user@host "echo ok"

Returns exit code 0 on success, non-zero immediately on failure. Perfect for connectivity checks in CI/CD or Ansible pre-tasks.

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