[root@localhost ~]# cat five.sh #!/bin/bash#任意输入5个数，判断最大值，最小值，总和s=0read -p "please input:" nums=$(($s+$num))max=$nummin=$numfor i in `seq 4`do       read -p "please input:" num      s=$(($s+$num))            if [ $num -le $min ];then        min=$num      fi      if [ $num -ge $max ];then         max=$num      fidoneecho sum:$s max:$max min:$min[root@localhost ~]# bash five.sh please input:30please input:20please input:40please input:10please input:0sum:100 max:40 min:0



[root@localhost ~]# cat 2five.sh #!/bin/bash#任意输入3个数，判断最大值，最小值，总和s=0n=0for i in `seq 3`do       read -p "please input:" num       expr  ${num}  +  0  1>/dev/null  2>&1         if   [   $?   -eq   0   ];then          echo   "${num}   is   a   number!"          else          echo   "${num}   is   not   a   number!"         exit         fi                 s=$(($s+$num))      [ $n -eq 0 ] && max=$num && min=$num      n=$(($n+1))             if [ $num -le $min ];then        min=$num      fi      if [ $num -ge $max ];then         max=$num      fidoneecho sum:$s max:$max min:$min n:$n[root@localhost ~]# bash 2five.sh please input:4040   is   a   number!please input:2020   is   a   number!please input:1010   is   a   number!sum:70 max:40 min:10 n:3[root@localhost ~]#