دانلود کتاب Bash Scripting – یادگیری پوسته bash

Is a program that works to receive commands from you and then ask the kernel to execute these commands. Ie acts as an intermediary between you and the operating system or in other words it represents the outer layer or interface of the system, it takes orders from you and gives you the result. Then it shows the inductor again, indicating termination, and waiting for you to enter more commands. This is why the shell is called a command interpreter, which is similar to command.com in windows. It also contains a programming language similar to high-level languages is very strong through which you can solve any problem you face. Also, one of the important features is the possibility of making a file containing a set of programs to create another program and this enables you to produce what is known as script, and there are many types of shell, but the most famous and used are the two main types:
· The Bourne shell includes the sh, ksh, bash
· The C shell includes csh, tcsh
If you are using a Bourne shell, the default inductor for you as a user is $.