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sp-labs's Issues

lab03b的Markdown网址错误

### 2.3. 正则
- 完成[LeetCode: 193. Valid Phone Numbers](https://leetcode-cn.com/problems/valid-phone-numbers/)(体会`grep -E`, `grep -P`, `egrep`, `awk`等的差异)
2.4. 文件读入
- 完成[LeetCode: 195. Tenth Line](https://leetcode.com/problems/valid-phone-numbers/),给出你的代码和 AC 截图。(提示:[怎么读取每一行](http://blog.sina.com.cn/s/blog_605f5b4f0101b0sd.html))

两个网址是一样的

lab03b最后一题可澄清题意

关于题目中的描述

### 2.6. 综合实验
...
  - 使用用法:`./addowner 目录名称`。(若无目录名称这一参数,则默认为当前目录)
...

建议考虑用户输入的目录名称末尾可能有/的情况。
例如

DIR_INPUT=${1-${PWD}}
DIR=$(echo ${DIR_INPUT} | sed 's/\/$//')  

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