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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.
• \openin & \openout: | Open a file. | |
• \read: | Read text from a file. | |
• \typein: | Read text from the terminal. | |
• \typeout: | Write text to the terminal. | |
• \write: | Write text to a file or terminal. |