In a shell, there are three types of control instructions:
Sequential Control: These instructions are executed one after the other in a sequential manner. They ensure that each command runs only after the previous one completes.
Conditional Control: Conditional instructions, like 'if' statements, enable decision-making in scripts. They execute commands based on specified conditions, allowing for branching and different outcomes.
Loop Control: Loop instructions, such as 'for' and 'while' loops, repeatedly execute commands until a specified condition is met, providing automation and repetitive task handling.