Shell is a command interpreter under the Linux system, which is also the main environment using the Linux system. There are many features of the shell, mainly from the basic concept of Shell, the species of the shell, special characters in the shell, a few aspects of the shell program. The focus is the special character and shell programming of the shell.
What is shell
When the user logs in into the Linux system, you can enter X Window-based graphics window system: KDE. Of course, many work can be done in graphical environments, but many of the server applications require remote connection to the server for management configuration, and use command line mode to manage more convenient and simple, so learn Linux, shell learning and use is An essential part.
If the system is set to not automatically start the graphical interface, then the user logs in is a shell prompt waiting for the input command. It is identified that the command can begin; if the system is set to automatically launch the graphics system, then the user can click [Start " → [THIZ MENU Instant Menu] → [Simplified Chinese Terminal (GB2312)] Run Terminal Terminal, enter any commands and parameters after the command prompt, as shown in Figure 3-1.
