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sed and awk Cookbook: Sum Columns, Filter Rows, Dedupe, Edit Files In Place and Avoid CSV Traps

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Self-Hosting & Infra beginner 6 min read $0.01 Updated 2026-10-20

Tested GNU sed 4.8 and awk recipes: print line ranges, substitute with regex groups, safe in-place edit with backup, field sums, conditional filters, associative arrays, dedupe with seen[$0]++, escaping dots, and the quoted-comma CSV limitation.

Process logs and CSV-ish files from the shell. Copy tested one-liners for summing columns, filtering, reformatting, deduplicating and in-place edits, and know where awk breaks on quoted CSV.

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#sed#awk#linux#shell#text-processing

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