10.1 Command Overview
10.1.1 Standard Input and Output
In the Shell, a standard device is already specified for the input device that receives the input data for execution and the output device for which the processing result is displayed. Therefore, unless there is a specific designation, data is always input from the standard input device, and the processing result is always output to the standard output device.
Chapter 10 Understanding Shell Command
Chapter’s Main Topics
This chapter describes the Shell command. It will first explain the basics of the Shell command, explain how to use the Shell command, and then describe the most basic Shell commands. We will not cover all the Shell commands here, and commands associated with a particular topic will be discussed together when dealing with the topic.
It includes descriptions on the following topics:
■ Command overview
■ Shell environment
■ Shell and profile
■ Basic command
■ Operation processing related commands
■ Selective execution related commands
■ Program execution related commands
■ Input and output adjustments related commands
■ Data manipulation related commands
■ System information related commands