posix meaning in English

计算机环境的可移植操作系统接口
计算机环境可移植操作系统接口
可移植操作系统接口

I wish chapter 3 had mentioned the posix
我希望第3章直接在介绍中提到posix
Call follows the posix standards only if the environment variable
调用才遵循posix标准。
Table 2 shows some examples of posix character blocks
表2展示了posix字符块的一些例子。
The aim is to move towards 100 percent posix compliance
其目标是实现百分之百posix兼容。
Posix information technology - portable operating system interface
信息技术.便携式操作系统接口

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