IEEE Std 1003.1-201x定义了标准操作系统接口和环境，包括命令解释器（或“shell”）和通用实用程序，以支持源代码级别的应用程序可移植性。它旨在供应用程序开发人员和系统实现人员使用。IEEE Std 1003.1-201x由四个主要部分组成（每个部分都在相关卷中）:1。IEEE Std 1003.1-201x所有卷共有的通用术语、概念和接口，包括实用惯例和C语言标题定义，均包含在IEEE Std 1003的基本定义卷中。 1-201x。2.IEEE Std 1003.1-201x的系统接口卷中包含了系统服务功能和子例程的定义、C编程语言的特定语言系统服务、功能问题，包括可移植性、错误处理和错误恢复。3.IEEE Std 1003.1-201x的外壳和实用程序卷中包含了命令解释服务（简称“外壳”）的标准源代码级接口和应用程序的通用实用程序的定义。4.扩展的基本原理不适合文件结构的其他部分，包含有关IEEE Std 1003内容的历史信息。 1-201x以及标准开发人员包含或丢弃功能的原因，包含在IEEE Std 1003.1-201x的基本原理（资料性）卷中。以下领域不在IEEE Std 1003.1-200x的范围内:*图形接口*数据库管理系统接口*记录I/O注意事项*对象或二进制代码可移植性*系统配置和资源可用性IEEE Std 1003.1-200x描述了对应用程序开发人员非常重要的外部特征和设施，而不是为了实现这些功能而采用的内部施工技术。 特别强调各种商业应用所需的功能和设施。

IEEE Std 1003.1-201x defines a standard operating system interface and environment, including a command interpreter (or "shell"), and common utility programs to support applications portability at the source code level. It is intended to be used by both applications developers and system implementors.IEEE Std 1003.1-201x comprises four major components (each in anassociated volume): 1. General terms, concepts, and interfaces common to all volumes of IEEE Std 1003.1-201x, including utility conventions and C-language header definitions, are included in the Base Definitions volume of IEEE Std 1003.1-201x. 2. Definitions for system service functions and subroutines, language-specific system services for the C programming language, function issues, including portability, error handling, and error recovery, are included in the System Interfaces volume of IEEE Std 1003.1-201x. 3. Definitions for a standard source code-level interface to command interpretation services (a "shell") and common utility programs for application programs are included in the Shell and Utilities volume of IEEE Std 1003.1-201x. 4. Extended rationale that did not fit well into the rest of the document structure, containing historical information concerning the contents of IEEE Std 1003.1-201x and why features were included or discarded by the standard developers, is included in the Rationale (Informative) volume of IEEE Std 1003.1-201x.The following areas are outside of the scope of IEEE Std 1003.1-200x: * Graphics interfaces * Database management system interfaces * Record I/O considerations * Object or binary code portability * System configuration and resource availabilityIEEE Std 1003.1-200x describes the external characteristics andfacilities that are of importance to applications developers, ratherthan the internal construction techniques employed to achieve thesecapabilities. Special emphasis is placed on those functions andfacilities that are needed in a wide variety of commercial applications.