linux shell实现求一个多维数组中的最大和最小值

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/bash
echo "the file is :"
cat 99shu
max=0
min=999999
line=1
dnum=$(cat 99shu| wc -l)
while (($line<=$dnum))
do
for i in $(cat 99shu|head -"$line")
    do
  ((max<$i))&&max=$i
    ((min>$i))&&min=$i
    done
let ++line
done

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 MIN

echo "the numbers is:"
cat 99shu
mnum=0
min=99999
while  read line 
do
declare -a arr=($line)
lnum=$(echo $line | wc -w)
i=0
while (( $i<$lnum ))
do
(($mnum<${arr[i]})) && mnum=${arr[i]}
(($min>${arr[i]})) && min=${arr[i]}
let ++i
done
done < 99shu
echo "the max number is $mnum"
echo "the min number is $min"

实现3，强大的awk

#! /bin/bash
echo "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/bash
min=$(cat  99shu | tr "t" "n"|tr " " "n"|sort -n|uniq|grep -v "^$"|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"