2019独角兽企业重金招聘Python工程师标准>>>
February 09 2019 Friday
Weather : rain
1、需求:
写一个脚本,执行后,打印一行提示“Please input a number:” ,要求用户输入数值,然后打印出该数值,然后再次要求用户输入数值。直到用户输入"end"停止。
[root@Dasoncheng sbin]# cat !$
cat a.sh
#!/bin/bash
##This script is for if you input "end" will end the shell , otherwise it will do all the time ;
while :;
do
read -p "Please input a number:(input "end" ,it will be exit )" n
num=`echo $n |sed 's/[0-9]//g' |wc -L`
if [ $n == end ];
then
exit
else
if [ $num -eq 0 ];
then
echo "The number you input is:$n"
else
echo "Isn't a number , please try again !"
fi
fi
done