add version argument to help function (#6377)
Signed-off-by: Stefan Pietsch <mail.ipv4v6+gh@gmail.com>
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@ -1091,6 +1091,7 @@ static int help(void) {
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printf("%s [OPTIONS...]\n\n"
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"Starts up and maintains the system or user services.\n\n"
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" -h --help Show this help\n"
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" --version Show version\n"
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" --test Determine startup sequence, dump it and exit\n"
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" --no-pager Do not pipe output into a pager\n"
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" --dump-configuration-items Dump understood unit configuration items\n"
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