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It's a good practice to end files with a single newline character. This ensures the file is compliant with POSIX standards and is handled correctly by various command-line tools and version control systems.1
Style Guide References
Footnotes
POSIX standards define a 'line' as a sequence of characters ending with a newline. A 'text file' is a file containing characters organized into zero or more lines. Therefore, text files should end with a newline character to be properly formed and to avoid issues with tools that process them. ↩