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| # no args example | |
| $ ./build/graal/hello-world | |
| # output | |
| Hello world :) | |
| # args example | |
| $ ./build/graal/hello-world --help | |
| # output | |
| Usage: hello [-hV] | |
| Says hello | |
| -h, --help Show this help message and exit. | |
| -V, --version Print version information and exit |
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