同事发了一道shell题，是求一个多维数组中的最大和最小值
如文件 99file：

33 55 23 56 99
234 234 545 6546 34
11 43 534 33 75
43 34 76 756 33
343 890 77 667 55

我的实现之一：

#! /bin/bashecho "the file is :"cat 99shumax=0min=999999line=1dnum=$(cat 99shu| wc -l)while (($line<=$dnum))dofor i in $(cat 99shu|head -"$line") do ((max<$i))&&max=$i ((min>$i))&&min=$i donelet ++linedone echo "the max number is: $max"echo "the min number is : $min"

结果：

the max number is: 6546
the min number is : 11

实现之二：

#! /bin/bash# echo the MAX and the MINecho "the numbers is:"cat 99shumnum=0min=99999while read line dodeclare -a arr=($line)lnum=$(echo $line | wc -w)i=0while (( $i<$lnum ))do(($mnum<${arr[i]})) && mnum=${arr[i]}(($min>${arr[i]})) && min=${arr[i]}let ++idonedone < 99shuecho "the max number is $mnum"echo "the min number is $min"

实现3，强大的awk

#! /bin/bashecho "the MAX number is: $( cat 99shu | awk '{for(i=1;i<=NF;i++)if(max<$i) max=$i;print max}'|tail -1)"echo "eht MIN number is: $( cat 99shu | awk '{min=999999;for(i=1;i<=NF;i++)if(min>$i)min=$i;print min}'|sort|head -1 )"

实现4：

#!/bin/bashmin=$(cat 99shu | tr "\t" "\n"|tr " " "\n"|sort -n|uniq|grep -v "^$"|head -1)max=$(cat 99shu | tr "\t" "\n"|tr " " "\n"|sort -n|uniq|grep -v "^$"|tail -1)echo "The MAX number is $max"echo "The MIN number is $min"