tldr/pages/common/awk.md

awk

A versatile programming language for working on files. More information: https://github.com/onetrueawk/awk.

• Print the fifth column (a.k.a. field) in a space-separated file:

awk '{print $5}' {{filename}}

• Print the second column of the lines containing "something" in a space-separated file:

awk '/{{something}}/ {print $2}' {{filename}}

• Print the last column of each line in a file, using a comma (instead of space) as a field separator:

awk -F ',' '{print $NF}' {{filename}}

• Sum the values in the first column of a file and print the total:

awk '{s+=$1} END {print s}' {{filename}}

• Sum the values in the first column and pretty-print the values and then the total:

awk '{s+=$1; print $1} END {print "--------"; print s}' {{filename}}

• Print every third line starting from the first line:

awk 'NR%3==1' {{filename}}

• Print all values starting from the third column:

awk '{ s = ""; for (i=3; i <= NF; i++) s = s $i " "; print s }'

• Print different values based on conditions:

awk '{if ($1 == "foo") print "Exact match foo"; else if ($1 ~ "bar") print "Partial match bar"; else print "Baz"}'