简单而又实用的UNIX系统常用命令，帮你快速掌握UNIX常用命令-Simple and practical UNIX system commands to help you quickly master the UNIX command

用C语言实现unix/linux下 ls -l 命令，里面的注释都是英文的但比较容易读懂-Unix/linux using C language under the ls-l command inside the notes are in English, but relatively easy to read

地震数据在Unix环境下的操作命令，可以为用户提供更加方便的操作。-Seismic data operation command in Unix environment, can provide users with more convenient operation.