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Invoking hello

The format for running the hello program is:

hello option ...

hello supports the following options:

`--help'
`-h'
Print an informative help message describing the options and then exit.
`--version'
`-v'
Print the version number of hello on the standard error output and then exit.
`--traditional'
`-t'
Use the traditional greeting message `hello, world' rather than the more modern `Hello, world!'.
`--mail'
`-m'
Print your mail on the standard output.


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