Print specific column
Print 2nd column:
awk '{print $2}' file.txt
Print multiple columns
awk '{print $1, $3}' file.txt
Custom delimiter (CSV)
awk -F',' '{print $1, $3}' data.csv
Print lines matching pattern
awk '/error/ {print}' app.log
Print lines where column matches
Print lines where 3rd column is "FAIL":
awk '$3 == "FAIL" {print}' test_results.txt
Sum a column
Sum all values in column 3:
awk '{sum += $3} END {print sum}' file.txt
Count lines
awk 'END {print NR}' file.txt
Print line numbers
awk '{print NR, $0}' file.txt
Filter by numeric comparison
Print lines where column 2 > 100:
awk '$2 > 100 {print}' file.txt
Calculate average
awk '{sum += $1; count++} END {print sum/count}' file.txt
Print last column
awk '{print $NF}' file.txt
Custom output format
awk '{printf "Name: %s, Score: %d\n", $1, $2}' file.txt
Process log timestamps
Extract hour from timestamp:
awk -F'[: ]' '{print $2}' access.log