Mastering the Linux Triad: AWK – The Swiss Army Knife of Data Processing
1. Overview of AWK Basics # Basic Structure awk 'BEGIN{preprocessing} {line processing} END{postprocessing}' filename # Common Variables NR: line number | NF: number of fields | $0: entire line content | $1: first column 2. High-Frequency Practical Scenarios 1. Data Deduplication Example: Retaining Unique Lines # Deduplicate entire lines (keep the first occurrence) awk '!seen[$0]++' … Read more