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2071 zjchen 1 
!! +exec+ +vardef+
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tit:default
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type:$type_exec
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syntax:!default `name'=`value'
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mean:如果变量 `name' 还没有定义, 则把 `value'\
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  赋值给 $`name'. <br>\
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  `value' 可以是变量命令(带着可选参数).