REXX (Restructured Extended Executor) is a high-level programming language developed by IBM in the 1970s. Originally created to provide a scripting language for use in the IBM VM/CMS operating system, REXX was designed to be easy to learn and use, offering a more accessible alternative to more complex programming languages available at the time. Its primary goal was to allow users to automate tasks, manipulate data, and create interactive scripts.
One of the defining features of REXX is its simplicity and readability, which makes it particularly suitable for both beginners and experienced programmers. The syntax of REXX is straightforward and resembles natural language, which lowers the barrier to entry for new users. Over the years, REXX has gained popularity not only within the IBM mainframe community but also across various platforms, including UNIX and Windows, thanks to its versatility and adaptability.
In the mid-1980s, REXX underwent significant enhancements, leading to the development of Object REXX, which added object-oriented programming features to the language. This evolution enabled developers to create more complex and structured applications while retaining the ease of use that REXX is known for. The language supports a wide array of functions, including string manipulation, file handling, and data processing, making it suitable for a variety of tasks.
REXX is commonly used for system programming, automation, and scripting tasks in corporate environments, particularly in industries that rely on IBM mainframes. It excels at processing text files, managing system tasks, and creating command-line utilities. Additionally, REXX scripts can be embedded in applications or called from other programming languages, enhancing its utility in mixed-language environments.
The language has been embraced in environments where quick prototyping and rapid development are essential. Its ability to interface with other languages and tools also makes it a valuable asset in the toolkit of many system administrators and developers.
A simple example of REXX code demonstrates its straightforward syntax:
/* Sample REXX Program */
say "Hello, World!"
exitIn this snippet, the command say outputs "Hello, World!" to the screen, illustrating how REXX prioritizes clarity and ease of use.
Despite the emergence of newer programming languages, REXX remains a popular choice for automation and scripting in IBM environments and beyond. Its combination of simplicity, versatility, and the ability to easily integrate with existing systems ensures that REXX continues to be a relevant tool for programmers and system administrators alike. Its long-standing presence in the programming landscape is a testament to its utility and effectiveness in addressing the needs of various industries.