[root@localhost zuoye]# cat quansges.sh
#!/bin/bash
> file
[ ! $# -ge 3 ] && echo "please input three number or more number!" && exit 2 || echo $* >file
for i in $*
do
expr $i + 1 &> /dev/null
[ $? -ne 0 ] && echo "input is error" && exit
done
a=`cat file |xargs -n1|sort -n|head -1`
b=`cat file |xargs -n1|sort -n|tail -1`
c=`cat file |xargs -n1|sort -n|wc -l`
d=`cat file |xargs -n1|awk '{a+=$1}'END'{print a}'`
#[ $b -ne 0 ] &&
echo "max number:"$b
#[ $a -ne 0 ] &&
echo "min number:"$a
echo "average is:" `awk 'BEGIN{printf "%.2f
", '$d'/'$c'}'`
[root@localhost zuoye]# bash quansges.sh 1 d 1
input is error
[root@localhost zuoye]# bash quansges.sh d d 1
input is error
[root@localhost zuoye]# bash quansges.sh d d d
input is error
[root@localhost zuoye]# bash quansges.sh d 1 1
input is error
[root@localhost zuoye]# bash quansges.sh 1 2 3 4 5 6 7 8 9 0
max number:9
min number:0
average is: 4.50
[root@localhost zuoye]# bash quansges.sh 1 2 3 4 5 6 7 8 9 10
max number:10
min number:1
average is: 5.50
[root@localhost zuoye]#
