方法一
#! /bin/bash
#按照数组求平均数
read -p "请输入数字(空格隔开):" str
array=(${str})
count=${#array[@]}
sum=0
for((i=0;i<${count};i++));
do
sum=$(($sum+${array[i]}))
done
保留两位小数
ave=`echo "scale=2;$sum/$count" | bc`
echo "平均数为:"$ave
方法二
#! /bin/bash
sum=0
for i in $*
do
echo "$i"
let "sum += $i"
done
average=$[ $sum/$# ]
echo "平均数是:$average"
方法三:
#! /bin/bash
c=`cat file |xargs -n1|sort -n|wc -l`
d=`cat file |xargs -n1|awk '{a+=$1}END {print a}'`
echo "平均数:" `awk 'BEGIN{printf "%.2f\n", '$d'/'$c'}'`
```