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A practical guide to robust, fast, scalable CSV handling in Bash: install gawk, Miller, datamash (plus jq), avoid naive comma-splitting, use gawk FPAT or Miller’s header-aware, CSV-correct ops to select, filter, compute, normalize dates, convert to JSON, dedupe, join, and aggregate; add data quality checks; stream multi-GB and gzipped files, sample efficiently, mind locales/headers/newlines, and build reusable pipelines.