vendor/clap/examples/tutorial_derive/04_02_parse.md

   1 ```console
   2 $ 04_02_parse_derive --help
   3 clap [..]
   4 A simple to use, efficient, and full-featured Command Line Argument Parser
   5
   6 USAGE:
   7     04_02_parse_derive[EXE] <PORT>
   8
   9 ARGS:
  10     <PORT>    Network port to use
  11
  12 OPTIONS:
  13     -h, --help       Print help information
  14     -V, --version    Print version information
  15
  16 $ 04_02_parse_derive 22
  17 PORT = 22
  18
  19 $ 04_02_parse_derive foobar
  20 ? failed
  21 error: Invalid value "foobar" for '<PORT>': invalid digit found in string
  22
  23 For more information try --help
  24
  25 $ 04_02_parse_derive 0
  26 ? failed
  27 error: Invalid value "0" for '<PORT>': 0 is not in 1..=65535
  28
  29 For more information try --help
  30
  31 ```