help command: add hint for option use.
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@ -106,6 +106,8 @@ int cmd_help(char **arg)
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vector_destroy(&v);
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vector_destroy(&v);
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printc("Type \"help <topic>\" for more information.\n");
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printc("Type \"help <topic>\" for more information.\n");
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printc("Use the \"opt\" command (\"help opt\") to set "
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"options.\n");
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#if defined(__Windows__) && !defined(USE_READLINE)
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#if defined(__Windows__) && !defined(USE_READLINE)
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printc("Press Ctrl+Z, Enter to quit.\n");
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printc("Press Ctrl+Z, Enter to quit.\n");
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#else
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#else
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