find ./ -type f -exec sed -i 's/ul class="litype_1" type="1"/ol/g' {} \;
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replace all <ul type="1" class="litype_1"> tags (typically, html produced by Discuz) in current directory to <ol>
Currently I don't find a way to replace those matching end tags </ul> to </ol>(maybe need a xml parser)
but it should be fine in most cases (browsers fix tags automatically )
)