<span class="line">[root@centos6 ~]<span class="comment"># cat ansheng.txt </span></span>
<span class="line">My name is quiet!</span>
<span class="line">I am a Linux Operation and Maintenance Engineer</span>
<span class="line">My youth will stay at eighteen</span>
<span class="line">I Hexo + Github made a static blog, blog address is: https://ansheng.me</span>
<span class="line">My mail: as@ansheng.me</span>
<span class="line">QQ: 6087414</span>
<span class="line">Thank you!</span>
<span class="line">[root@ansheng ~]<span class="comment"># grep -vn --color=auto "^$" ansheng.txt </span></span>
<span class="line">1:My name is quiet!</span>
<span class="line">2:I am a Linux Operation and Maintenance Engineer</span>
<span class="line">3:My youth will stay at eighteen</span>
<span class="line">4:I Hexo + Github made a static blog, blog address is: https: //ansheng.me</span>
<span class="line">5:My mail: as@ansheng.me</span>
<span class="line">6:QQ: 6087414</span>
<span class="line">7:Thank you!</span>
<span class="line">[root@ansheng ~]<span class="comment"># grep --color=auto "." ansheng.txt </span></span>
<span class="line">My name is quiet!</span>
<span class="line">I am a Linux Operation and Maintenance Engineer</span>
<span class="line">My youth will stay at eighteen</span>
<span class="line">I Hexo + Github made a static blog, blog address is: https: //ansheng.me</span>
<span class="line">My mail: as@ansheng.me</span>
<span class="line">QQ: 6087414</span>
<span class="line">Thank you!</span>
<span class="line">[root@ansheng ~]<span class="comment"># grep --color=auto "0*" ansheng.txt </span></span>
<span class="line">My name is quiet!</span>
<span class="line">I am a Linux Operation and Maintenance Engineer</span>
<span class="line">My youth will stay at eighteen</span>
<span class="line">I Hexo + Github made a static blog, blog address is: https: //ansheng.me</span>
<span class="line">My mail: as@ansheng.me</span>
<span class="line">QQ: 6087414</span>
<span class="line">Thank you!</span>
<span class="line">[root@ansheng ~]<span class="comment"># grep --color=auto ".*" ansheng.txt </span></span>
<span class="line">My name is quiet!</span>
<span class="line">I am a Linux Operation and Maintenance Engineer</span>
<span class="line">My youth will stay at eighteen</span>
<span class="line">I Hexo + Github made a static blog, blog address is: https: //ansheng.me</span>
<span class="line">My mail: as@ansheng.me</span>
<span class="line">QQ: 6087414</span>
<span class="line">Thank you!</span>
<span class="line">[root@ansheng ~]<span class="comment"># grep --color=auto "[abc]" ansheng.txt </span></span>
<span class="line">My name is quiet!</span>
<span class="line">I am a Linux Operation and Maintenance Engineer</span>
<span class="line">My youth will stay at eighteen</span>
<span class="line">I Hexo + Github made a static blog, blog address is: https: //ansheng.me</span>
<span class="line">My mail: as@ansheng.me</span>
<span class="line">Thank you!</span>
<span class="line">[root@ansheng ~]<span class="comment"># grep --color=auto "[^abc]" ansheng.txt </span></span>
<span class="line">My name is quiet!</span>
<span class="line">I am a Linux Operation and Maintenance Engineer</span>
<span class="line">My youth will stay at eighteen</span>
<span class="line">I Hexo + Github made a static blog, blog address is: https: //ansheng.me</span>
<span class="line">My mail: as@ansheng.me</span>
<span class="line">QQ: 6087414</span>
<span class="line">Thank you!</span>