shell 和awk性能对比

time for ((i=0;i<10000;i++)) do ((sum+=i)); done

real    0m0.086s
user    0m0.079s
sys    0m0.007s


time awk 'BEGIN{for(i=0;i<10000;i++) sum+=i; print sum}'

real    0m0.002s
user    0m0.001s
sys    0m0.001s