常用命令--awk

awk '{
     BEGIN{stat1}
     BEGIN{stat2}
     pattern1{action1}
     pattern2{action2}
     ...
     patternn{actionn}
     {默认动作,无条件,始终执行}
     END{stat1}
     END{stat2}
}'

awk 'BEGIN{
for(i=;i<=;i++)
    {
        for(j=;j<=;j++)
        {
            tarr[i,j]=i*j;
            print i,"*",j,"=",tarr[i,j];
        }
    }
}'

# awk 打印 99乘法表
awk 'BEGIN{
for(i=;i<;i++)
    {
        for(j=;j<=i;j++)
        {
            printf "%d%s%d%s%d\t",j,"*",i,"=",i*j;
        }
        printf "\n"
    }
}'

# awk 浮点计算
aa=
bb=
awk -v m1=$aa -v m2=$bb 'BEGIN{
    num = m1/m2;
    print m1;
    print m2;
    print num;
    printf "%.9f\n", num;
}'

# 计算器
firstNum=
secondNum=102.4
ss=`awk -v m1=$firstNum -v m2=$secondNum 'BEGIN{num = m1/m2; printf "%.9f\n", num;}'`
echo $ss
201.611328125