awk.md

awk

sum integers from a file or stdin, one integer per line:

printf '1\n2\n3\n' | awk '{ sum += $1} END {print sum}'

using specific character as separator to sum integers from a file or stdin

printf '1:2:3' | awk -F ":" '{print $1+$2+$3}'

print a multiplication table

seq 9 | sed 'H;g' | awk -v RS='' '{for(i=1;i<=NF;i++)printf("%dx%d=%d%s", i, NR, i*NR, i==NR?"\n":"\t")}'

Specify output separator character

printf '1 2 3' | awk 'BEGIN {OFS=":"}; {print $1,$2,$3}'