Input/output (LaTeX2e unofficial reference manual (November 2018))

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## 27 Input/output

LaTeX uses the ability to write to a file and later read it back in to build document components such as a table of contents or index. You can also read a file that other programs written, or write a file for others to read. You can communicate with users through the terminal. And, you can issue instructions for the operating system.

Unofficial LaTeX2e reference manual