使用man命令查看ps：report a snapshot of the current processes，记录当前时刻的进程状态快照，此命令是如何工作的，man中也介绍了，This ps works by reading the virtual files in /proc。此命令是通过查询/proc中的各个文件总结出来的。内存中的数据都会写入到/proc中，如图简单介绍下 ps命令有三种风格: 1 UNIX options, which may be grouped and must be preceded by a dash. 2 BSD options, which may be grouped and must not be used with a dash. 3 GNU long options, which are preceded by two dashes. ps命令的选项是非常之多的，常用组合有以下
