bash shell计算时间差

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function getTiming() {  start=$1 end=$2 start_s=$(echo $start | cut -d '.' -f 1)  start_ns=$(echo $start | cut -d '.' -f 2)  end_s=$(echo $end | cut -d '.' -f 1)  end_ns=$(echo $end | cut -d '.' -f 2)  time=$(( ( 10#$end_s - 10#$start_s ) * 1000 + ( 10#$end_ns / 1000000 - 10#$start_ns / 1000000 ) ))  echo "$time ms" }   start=$(date +%s.%N) end=$(date +%s.%N) runtime=$(getTiming $start $end) echo "runtime: "$runtime