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Awk's associative arrays turn frequency counting and log aggregation into a one-liner. Here's the count[key]++ pattern, a worked example, and the memory and ordering limits to watch.
An architecture note on using awk associative arrays for streaming group-by aggregation: requirements, trust boundaries at field splitting and key cardinality, operational checks, failure modes, and when to move to a database or stream processor.
Awk's associative arrays replace sort | uniq -c with a single-pass aggregation. Learn the auto-vivification trap, the 'in' operator, and when the in-memory approach stops scaling.
awk