[rustc.git] / vendor / clap-4.2.1 / examples / tutorial_derive / 04_02_validate.md

```console
$ 04_02_validate_derive --help
A simple to use, efficient, and full-featured Command Line Argument Parser

Usage: 04_02_validate_derive[EXE] <PORT>

Arguments:
  <PORT>  Network port to use

Options:
  -h, --help     Print help
  -V, --version  Print version

$ 04_02_validate_derive 22
PORT = 22

$ 04_02_validate_derive foobar
? failed
error: invalid value 'foobar' for '<PORT>': `foobar` isn't a port number

For more information, try '--help'.

$ 04_02_validate_derive 0
? failed
error: invalid value '0' for '<PORT>': port not in range 1-65535

For more information, try '--help'.

```
Commit	Line	Data
49aad941 FG	1	```console
	2	$ 04_02_validate_derive --help
	3	A simple to use, efficient, and full-featured Command Line Argument Parser
	4
	5	Usage: 04_02_validate_derive[EXE] <PORT>
	6
	7	Arguments:
	8	<PORT> Network port to use
	9
	10	Options:
	11	-h, --help Print help
	12	-V, --version Print version
	13
	14	$ 04_02_validate_derive 22
	15	PORT = 22
	16
	17	$ 04_02_validate_derive foobar
	18	? failed
	19	error: invalid value 'foobar' for '<PORT>': `foobar` isn't a port number
	20
	21	For more information, try '--help'.
	22
	23	$ 04_02_validate_derive 0
	24	? failed
	25	error: invalid value '0' for '<PORT>': port not in range 1-65535
	26
	27	For more information, try '--help'.
	28
	29	```