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.

• \openin & \openout
• \read
• \typein
• \typeout
• \write