Creating and Using Arrays in Bash Shell Script In Bash scripting, arrays are used to store multiple values in a single variable. Here's a step-by-step beginner-friendly explanation of how to create and use arrays. 1. Declaring an Array You can create an array by assigning values to it using parentheses () and separating the values with spaces. Example: my_array=(apple banana cherry) Here: my_array is the name of the array. It stores three elements: "apple" , "banana" , and "cherry" . 2. Accessing Array Elements Array elements are accessed using their index , starting from 0 . You use the syntax ${array_name[index]} to access an element. Example: echo ${my_array[0]} # Outputs: apple echo ${my_array[1]} # Outputs: banana echo ${my_array[2]} # Outputs: cherry 3. Adding Elements to an Array You can add a new element by assigning a value to a specific index. Example: my_array[3]= "date" echo ${my_array[3]} # Outputs: date 4. Di...
Definition of the Shell Shell is an interactive environment which provides an interface to an Operating System. It gathers input from user and execute the commands. Bourne shell(sh)- 1977 The Bourne shell was introduced. The Bourne shell(sh), by Stephen Bourne at AT&T Bell Labs for V7 UNIX, remains a useful shell today (in some cases, as the default root shell). The Bourne shell was developed after working on an ALGOL68 compiler, so its grammar is more along the lines of Algorithmic Language (ALGOL) than other shells. The source code was developed in C. The Bourne shell served two primary goals: Executing UNIX/Linux commands for the operating system,i.e, command line interpreter Writing reusable scripts that could be invoked through the shell,i.e, scripting In addition to replacing the Thompson shell, the Bourne shell offered many other advantages over its predecessors such as control flows, loops, and variables into scripts, providing a more functional language to...