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### 2.5.2 Line Maps

Virtual code applications invoked with the ‘`--line-map`’ option (with or without the ‘`--unparameterized`’ option) adhere to a very simple interface.

- The argument to the function is a character string, and the result must also be a character string.
- The function is applied to each line of the standard input file and the result in each case is written to standard output followed by a line break.

This kind of application may be used on finite or infinite streams, provided that the lengths of the lines are finite, but preserves no state information from one line to the next.

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