linux 下的shell编程，一些基础的shell编程内容，谢谢！-example： echo "this is the $numnd" grep "hello" file.txt | wc-l and so on!

linux下三大文件处理grep、sed和gawk公具详细分析，是学习linux的必备资料，希望对你有用！-three under linux document processing grep, sed and awk public with detailed analysis must learn linux, hope useful to you!