linux shell 计算平均值

1班（class1）的平均值：awk 'BEGIN{sum=0num=0}{if($2=="class1"){sum+=$3num+=1}}END{printf "%f\n",sum/num}' c.txt2班（class2）的平均值：awk 'BEGIN{sum=0num=0}{if($2=="class2"){sum+=$3num+=1}}END{printf "%f\n",sum/num}' c.txt3班（class3）的平均值：awk 'BEGIN{sum=0num=0}{if($2=="class3"){sum+=$3num+=1}}END{printf "%f\n",sum/num}' c.txt

#!/bin/bash

#任意输入5个数，判断最大值，最小值，总和

s=0

read-p"pleaseinput:"num

s=$(($s+$num))

max=$num

min=$num

avg=$(($s/5))

foriin`seq4`

do

read-p"pleaseinput:"num

s=$(($s+$num))

if[$num-le$min]then

min=$num

fi

if[$num-ge$max]then

max=$num

fi

done

echomax:$maxmin:$minavg:$avg

扩展资料：

for循环：

一般格式为：

forvarinitem1item2...itemN

do

command1

command2

...

commandN

done

写成一行：

forvarinitem1item2...itemNdocommand1command2?done

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