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```console
$ 04_04_custom --help
clap [..]
A simple to use, efficient, and full-featured Command Line Argument Parser
USAGE:
04_04_custom[EXE] [OPTIONS] [INPUT_FILE]
ARGS:
<INPUT_FILE> some regular input
OPTIONS:
-c <CONFIG>
-h, --help Print help information
--major auto inc major
--minor auto inc minor
--patch auto inc patch
--set-ver <VER> set version manually
--spec-in <SPEC_IN> some special input argument
-V, --version Print version information
$ 04_04_custom
? failed
error: Can only modify one version field
USAGE:
04_04_custom[EXE] [OPTIONS] [INPUT_FILE]
For more information try --help
$ 04_04_custom --major
Version: 2.2.3
$ 04_04_custom --major --minor
? failed
error: Can only modify one version field
USAGE:
04_04_custom[EXE] [OPTIONS] [INPUT_FILE]
For more information try --help
$ 04_04_custom --major -c config.toml
? failed
Version: 2.2.3
error: INPUT_FILE or --spec-in is required when using --config
USAGE:
04_04_custom[EXE] [OPTIONS] [INPUT_FILE]
For more information try --help
$ 04_04_custom --major -c config.toml --spec-in input.txt
Version: 2.2.3
Doing work using input input.txt and config config.toml
```
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