Subprograms (Functions) in Linux Shell Scripting

A subprogram, often known in programming as a function or modular programming, is an independent block of code used within a larger program. This code block, which can be called repeatedly, is designed to perform a specific task. The main purpose of a subprogram is to divide code into smaller modules to avoid repetition and improve the program's structure.

In Linux shell scripting, subprograms are called functions. A function is a block of code in a shell script that can be called at any time, allowing for code reuse and better management.