nhs-number-cli 0.1.0

National Health Service (NHS) number for NHS England, NHS Wales, NHS Isle of Man.
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# NHS Number command line interface (cli)

A National Health Service (NHS) Number is a unique number allocated in a shared
numbering scheme to registered users of the three public health services in
England, Wales, and the Isle of Man.

This tool is a command line interface that parses each standard input line into
an NHS number, then validates the check digit is correct.

* If the line is a valid NHS number, then print it.

* If the line is an invalid NHS Number, or is unparseable, then print an error message.

* If the line is blank, then skip it.

References:

* [National Health Service (NHS)](https://en.wikipedia.org/wiki/National_Health_Service)

* [NHS Number](https://en.wikipedia.org/wiki/NHS_number)

## Examples

Suppose you have a text file `input.txt`:

```txt
999 123 4560
999 123 4561
```

You can parse each line and validate it:

```sh
cat input.txt | nhs-number-cli
```

The output is one stdout line and one stderr line:

```stdout
999 123 4560
```

```stderr
Error invalid line 1. Error: validate check digit failed. NHS Number: 999 123 4561
```