Sum a column awk
Accumulate a numeric column and print total
awk '{sum += $4} END {print sum}' access.log
more awk
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Print lines between two patterns
awk '/START/,/END/' file.txt
Skip header line
awk 'NR>1 {print $1, $2}' data.csv
Count occurrences per key
awk '{count[$1]++} END {for (k in count) print count[k], k}' access.log | sort -rn
Print last field
awk '{print $NF}' file.txt
Multi-condition filter
awk '$2 > 500 && $5 == "POST"' access.log