1加到100计算

awk 'BEGIN{sum=0;i=0;while(i<=100){sum+=i;i++};{print sum}}'

awk 'BEGIN{sum=0;for(i=0;i<=100;i++){sum+=i};print sum}'

#awk -F: '/root/{i=1;while(i<=NF){print $i,length($i);i++}}' /etc/passwd awk 'BEGIN{sum=0;i=1;do {sum+=i;i++}while(i<=100);print sum}'