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This node describes conventions for writing robust software. It also describes general standards for error messages, the command line interface, and how libraries should behave.
4.1 Writing Robust Programs Writing robust programs 4.2 Library Behavior Library behavior 4.3 Formatting Error Messages Formatting error messages 4.4 Standards for Interfaces Generally Standards about interfaces generally 4.5 Standards for Graphical Interfaces Standards for graphical interfaces 4.6 Standards for Command Line Interfaces Standards for command line interfaces 4.7 Table of Long Options Table of long options 4.8 Memory Usage When and how to care about memory needs 4.9 File Usage Which files to use, and where