替换字符串 ：sed
算数运算：expr / bc
grep中的正则表达式：
https://linux.cn/article-6941-1.html
grep详解：
https://www.linuxprobe.com/grep-find-file.html#:~:text=%E5%A4%A7%E5%B0%8F%E5%86%99%E4%B8%8D%E6%95%8F%E6%84%9F%E7%9A%84%E6%90%9C%E7%B4%A2%20%E9%BB%98%E8%AE%A4%E6%83%85%E5%86%B5%E4%B8%8B%E6%90%9C%E7%B4%A2%E6%98%AF%E5%A4%A7%E5%B0%8F%E5%86%99%E6%95%8F%E6%84%9F%E7%9A%84%EF%BC%8C%E4%B9%9F%E5%B0%B1%E6%98%AF%E8%AF%B4%E5%BD%93%E6%90%9C%E7%B4%A2%E5%AD%97%E7%AC%A6%E4%B8%B2%20stretch%20%E6%97%B6%E5%8F%AA%E4%BC%9A%E5%8C%85%E5%90%AB%E5%A4%A7%E5%B0%8F%E5%86%99%E4%B8%80%E8%87%B4%E5%86%85%E5%AE%B9%E7%9A%84%E6%96%87%E4%BB%B6%E3%80%82%20%E9%80%9A%E8%BF%87%E4%BD%BF%E7%94%A8%20grep%20%E7%9A%84%20-i,grep%20%E5%91%BD%E4%BB%A4%E8%BF%98%E4%BC%9A%E5%88%97%E5%87%BA%E6%89%80%E6%9C%89%E5%8C%85%E5%90%AB%20Stretch%20%EF%BC%8C%20STRETCH%20%EF%BC%8C%20StReTcH%20%E7%AD%89%E5%86%85%E5%AE%B9%E7%9A%84%E6%96%87%E4%BB%B6%EF%BC%8C%E4%B9%9F%E5%B0%B1%E6%98%AF%E8%AF%B4%E8%BF%9B%E8%A1%8C%E7%9A%84%E6%98%AF%E5%A4%A7%E5%B0%8F%E5%86%99%E4%B8%8D%E6%95%8F%E6%84%9F%E7%9A%84%E6%90%9C%E7%B4%A2%E3%80%82
find命令详解：
https://www.cnblogs.com/RXDXB/p/11696751.html#:~:text=find%E5%91%BD%E4%BB%A4%E6%98%AF%E7%94%A8,%E7%9B%AE%E5%BD%95%E4%B8%8B%E9%9D%A2%E7%9A%84%E6%96%87%E4%BB%B6%E3%80%82
vi快捷键：
https://www.jianshu.com/p/afcf3ae8b015
shell终端快捷键：
https://zhuanlan.zhihu.com/p/29538650#:~:text=%20Ctrl%20%2B%20Alt%20%2B%20t%EF%BC%9A%E6%89%93%E5%BC%80%E4%B8%80%E4%B8%AA%E6%96%B0%E7%9A%84%E7%BB%88%E7%AB%AFterminal%EF%BC%8C%E4%B9%9F%E5%B0%B1%E6%98%AF%E4%B8%80%E4%B8%AA%E6%96%B0%E7%9A%84%E7%AA%97%E5%8F%A3window%E3%80%82%20Shift,%2BCtrl%20%2B%20t%EF%BC%9A%E5%9C%A8%E5%B7%B2%E6%9C%89%E7%BB%88%E7%AB%AF%E4%B8%8A%E6%89%93%E5%BC%80%E4%B8%80%E4%B8%AA%E6%96%B0%E7%9A%84tab%EF%BC%8C%E8%80%8C%E4%B8%8D%E6%98%AF%E7%AA%97%E5%8F%A3window%E3%80%82%20Shift%20%2BCtrl%20%2B%20n%EF%BC%9A%E5%9C%A8%E5%B7%B2%E6%9C%89%E7%BB%88%E7%AB%AF%E4%B8%8A%E6%89%93%E5%BC%80%E5%8F%A6%E4%B8%80%E4%B8%AA%E6%96%B0%E7%9A%84%E7%BB%88%E7%AB%AF%EF%BC%8C%E5%8D%B3%E4%B8%80%E4%B8%AA%E6%96%B0%E7%9A%84%E7%AA%97%E5%8F%A3%E3%80%82
linux iosf相关：
https://linux.cn/article-4099-1.html
linux其他命令详解：
https://recomm.cnblogs.com/blogpost/4188972?page=1
