The shell can be defined as a command interpreter on an operating system like Linux / GNU / UNIX. This is a program that runs other programs. The shell features each user's computer as a UNIX / GNU Linux System interface. Therefore, the user can make different tools/utilities or commands with a few input data.
When running a program that is running a program, the user sends the user to the user through the shell screen. That is why it is called "command interpreter." Shell is not only a command interpreter. Additionally, the shell is the complete programming language such as functions, variables, variables, variables, loops, conditional execution, etc.
There are two different types of Shell:
Graphical Shells - These shells specify these shells by manipulations of moving and closing windows of moving and closing windows. To interact with the program, you can check the Ubuntu OS or Windows OS as an excellent example to the user who will offer a graphical user interface. No need to type a command for different users.
Command-Line Shells - Users can access various shells with the help of a command-line interface. “ls," "cat" offer a unique program known as the Command Prompt in the MacOS / Linux; it runs more. The user's result is shown more than the user in the terminal.
Running in a command-line shell is difficult to remember many of the commands for many beginners. The command-line shell is very dominant and allows users to store and store the commands in a file and run them together. In this way, you can easily automate the repeat function. Usually, shell scripts in these files / Linux systems are known as the batch of windows.
There are various types of shells as follows:
This is known as a command prompt; it is provided through the shell. We can type any command when prompted. Shell reading our input after we clicked Enter. This shows the command we want to run by the initial word of our input. A word can be defined as an unbroken set of characters, and tabs and spaces separate words.
The Command Script is the general idea of the shell script. A good shell script will contain comments on the # symbol. Shell functions and scripts are interpreted, which means they do not compile. Conditional tests such as value y are more significant than value z, can contain and store and read data, store and read data, have these scripts, and include these scripts.
The shells are usually interactive, which means they get commands as the user's input and run them. Sometimes we want to run a set of commands regularly, but we should type for commands within the terminal. A shell script includes syntax and consists of syntax. When we get the previous experience, we get the prior experience with C / C ++ and Python, etc., when we get the last incident. The shell script combines the below components:
There are many reasons to use the shell scripts: