Generally, computer hardware by the operator, controller, memory, input / output devices composed of, and let the various hardware devices can perform their duties, and what operation is coordinated system kernel. Linux kernel is responsible for the complete system of hardware resources allocation, scheduling and other administrative tasks. Thus, the normal operation of a computer system kernel is concerned is too important, it is generally not recommended to go directly to edit parameters in the kernel, but allow users to manage computer through an interface developed based on system calls the program or service, meet the needs of daily work, as shown in FIG.
Figure user interaction with the Linux system
Shell is such a command-line tool. Shell (also referred to as terminal or shell) acts as a translator between the people and the core (hardware), users put some command "tell" the terminal, it will call the appropriate program service to complete some of the work. Now many mainstream systems, including Linux RHEL system, including the default terminal using Bash (Bourne-Again SHell) interpreter. Select the mainstream Linux system Bash interpreter as a command-line terminal has the following four major advantages, the reader can feel for the beauty of Linux system command line in the future of learning and production work, really fell in love with them from the heart.
1: Linux commands to call up the bond executed by passing the vertical direction;
2: input command or parameter just prior to completion can be several Tab key;
3: a powerful batch script;
4: a practical environment variable function.
