偶看新闻以前一后来一现在造句:Chapter 1. UNIX System Overview
来源：百度文库 编辑：偶看新闻 时间：2024/04/29 11:16:26
1.1. IntroductionAll operating systems provide services for programs they run. Typical services include: a. executing a new program, b. opening a file, c. reading a file, d. allocating a region of memory, e. getting the current time of day, and so on. 1.2. UNIX ArchitectureAn operating system can be defined as the software that a. controls the hardware resources of the computer and b. provides an environment under which programs can run. System calls: the interface to the kernel is a layer of software
Shell: a special application that provides an interface for running other applications.
1.3. Logging InA shell is a command-line interpreter that reads user input and executes commands.
1.4. Files and DirectoriesEvery process has a working directory, sometimes called the current working directory.A process can change its working directory with the chdir function.
Shell: a special application that provides an interface for running other applications.
1.3. Logging InA shell is a command-line interpreter that reads user input and executes commands.
1.4. Files and DirectoriesEvery process has a working directory, sometimes called the current working directory.A process can change its working directory with the chdir function.
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