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54 lines
1.1 KiB
Markdown
54 lines
1.1 KiB
Markdown
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Positional arguments are those values after the program name which are not preceded by any
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identifier (such as "myapp some_file"). Positionals support many of the same options as
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flags, as well as a few additional ones.
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Let's look at their help:
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```bash
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$ 06_positional_args --help
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MyApp
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USAGE:
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06_positional_args[EXE] <input> [config]
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ARGS:
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<input> the input file to use
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<config> the config file to use
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OPTIONS:
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-h, --help Print help information
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```
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First, we see that the first argument is required:
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```
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$ 06_positional_args
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? failed
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error: The following required arguments were not provided:
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<input>
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<config>
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USAGE:
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06_positional_args[EXE] <input> [config]
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For more information try --help
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```
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That first argument causes the second to be required:
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```
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$ 06_positional_args input.txt
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? failed
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error: The following required arguments were not provided:
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<config>
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USAGE:
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06_positional_args[EXE] <input> <config> [config]
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For more information try --help
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```
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Everything works now that we specify both:
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```
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$ 06_positional_args input.txt config.toml
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An input file was specified
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Doing work with input.txt and config.toml
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```
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