bash 函数思想实现数组冒泡排序

　　

#!/bin/env sh

read -p 'input length of array:' var
[[ ! $var =~ [[:digit:]] ]] && echo 'input wrong' && exit 5

declare -a pp

for z in `seq 0 1 $[var-1]`;do
    pp[$z]=$RANDOM
done

echo ${pp[@]}

function desc(){
    local pp
    declare -a pp
    pp=($@)
    local num=${#pp[*]}
    echo $num
    for ((i=0;i<num;i++));do
        for ((j=i+1;j<num;j++));do
            if [ ${pp[i]} -lt ${pp[j]} ];then
                nn=${pp[i]}
                pp[i]=${pp[j]}
                pp[j]=$nn
            fi
        done
    done
    echo "desc sort:"
    echo ${pp[*]}
}

desc ${pp[*]}

function asc(){
    local pp
    declare -a pp
    pp=($*)
    local num=${#pp[*]}
    echo $num
    for ((i=0;i<num;i++));do
        for ((j=i+1;j<num;j++));do
            if [ ${pp[i]} -gt ${pp[j]} ];then
                nn=${pp[i]}
                pp[i]=${pp[j]}
                pp[j]=$nn
            fi
        done
    done

    echo "asc scort:"
    echo ${pp[@]}
}

asc ${pp[*]}

bash 中不能直接传递数组,只能先拆包在重新生成数组

开始先利用[[ ]]做正则条件判断,非数字退出