2018/02/09

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

转载于:https://my.oschina.net/u/3651233/blog/1620880