shell实现二分查找（鸟用没有不如直接awk输出

chzenable

于 2021-02-01 21:32:21 发布

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分类专栏：屁话文章标签： shell awk

本文链接：https://blog.youkuaiyun.com/zhuanju6759/article/details/113530129

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本文探讨如何利用shell脚本与awk命令来实现快速的二分查找算法，对比两者在查找效率上的差异，并指出在特定场景下awk可能提供更优的解决方案。

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hmi_path=$1
hmi_file=$(ls -t1 $1/@CACHE_HMI_*.hmi | head -n 1)
lines=`echo $(wc -l $hmi_file) | cut -d" " -f1`
echo "Total file lines:$lines"

cut_timestamp=$2
remain_second=30
# The actually case timestamp in microsecond
end_timestamp=$cut_timestamp

if [[ -z $end_timestamp ]]; then
  echo "record is empty"
else
  # Cut timestamp in 60 second
  start_timestamp=$((end_timestamp - remain_second * 1000000))
fi

function dichotomic_search() {
  min=$1
  max=$2
  target=$3

  while [ $min -lt $max ]; do
    # Compute the mean between min and max, rounded up to the superior unit
    current=$(expr '(' "$min" + "$max" + 1 ')' / 2)
    #    if $command $current
    middle=$(awk 'NR=='$current' {print; exit}' $hmi_file | cut -d":" -f1)
    min_v=$(awk 'NR=='$min' {print; exit}' $hmi_file | cut -d":

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