Build a safe script to run commands across multiple remote hosts in parallel, with key auth, error isolation, and aggregated results.
## CONTEXT Running the same command across a fleet of servers is a daily sysadmin need, and doing it by hand invites mistakes and missed hosts. In 2026 a solid remote-execution script uses SSH key authentication, runs against a host list, isolates failures so one unreachable host does not stop the rest, and aggregates…
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