add -? arg support
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@ -32,7 +32,7 @@ Send ICMP ECHO_REQUEST packets to network hosts.\n\
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-W, --linger=N Number of seconds to wait for response\n\
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-v, --verbose Enable verbose mode\n\
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\n\
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-h, --help Print this usage info\n"
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-h, -?, --help Print this usage info\n"
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extern int g_stop;
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