Shell scripting language is realized linux system automation management important and necessary tool for almost every qualified linux system administrator or advanced operation and maintenance engineers have skilled shell scripting language , the only way to improve efficiency and solve work repetitive work. (Shell is the operation and maintenance of rice, bread, other high-level languages are the icing on the cake, operation and maintenance must master the shell, go to study other)
First, what is the shell, and shell scripts
A shell is a command interpreter, the outermost layer of the operating system, responsible for direct dialogue with the user, the user's input explain to the operating system, and process the output of a variety of operating systems, output to the screen back to the user. This dialogue is an interactive way (keyboard input and immediate results), or non-interactive (script) way.
English is the shell of shells, his position in the operating system is shown: Here we note that the core of the system, including kernel and various libraries. in which the shell is a errands role.
When the linux command line command or statement is not executed, but through the implementation of a program file is a shell script or shell program. shell like a batch program under DOS (* .bat). White said the statement is the command, control and process variables.