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由 Lai Jiangshan 提交于
A VSH_OFLAG_REQ_OPT option means --optionname is required when used. It will kill any ambiguity, even a !VSH_OFLAG_REQ option listed before a VSH_OFLAG_REQ option, if the !VSH_OFLAG_REQ option is a VSH_OFLAG_REQ_OPT option. It will help us use optional argument with VSH_OT_ARGV argument. Signed-off-by: NLai Jiangshan <laijs@cn.fujitsu.com>
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