Cheat Sheets

The AWS CLI commands you actually run during an incident, in the order you run them — from 'which account am I in' to a quota that stopped a scale-out.

Undoing the commit, the push, the rebase and the reset — including how to recover work that looks permanently gone.

The commands you actually run during a Kubernetes incident, in the order you run them — from a Pending pod to a dead node to an empty Service.

A repeatable 60-second triage for a slow or unresponsive host — CPU, memory, disk and process state — plus the metrics that routinely mislead.

Walk a network fault layer by layer — reachability, routing, ports, DNS, TLS and packet capture — and prove whether latency lives in the network or the application.

Quoting, expansion, strict mode, traps and the constructs that silently corrupt data — the reference for writing shell that survives production.