AWK Reference
Essential AWK commands, built-in variables, and common patterns.
The data
0
- Pattern
- Print columns
- Command
- awk '{print $1, $3}'
- Description
- Print the 1st and 3rd fields of each line.
1
- Pattern
- Field separator
- Command
- awk -F: '{print $1}' /etc/passwd
- Description
- Use colon as delimiter; print 1st field.
2
- Pattern
- Built-in variables
- Command
- NR, NF, FS, OFS, RS, ORS, FILENAME
- Description
- NR=record number, NF=field count, FS=OFS=field sep, RS=record sep.
3
- Pattern
- Conditional print
- Command
- awk '$3 > 100 {print $1}'
- Description
- Print $1 only when $3 exceeds 100.
4
- Pattern
- Sum a column
- Command
- awk '{sum += $2} END {print sum}'
- Description
- Accumulate sum of column 2 and print at END.
5
- Pattern
- Pattern matching
- Command
- awk '/error/ {print}' log.txt
- Description
- Print lines matching the regex /error/.
6
- Pattern
- Functions
- Command
- length(), sub(), gsub(), split(), systime()
- Description
- Built-in string and time functions.
7
- Pattern
- Multi-character FS
- Command
- awk -v FS="\t" '{print $2}'
- Description
- Set field separator to tab using -v flag.
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