hfxiang

1.只保留最先的2个，其它删除

for /f "skip=2 tokens=*" %a in ('dir /b/a-d/s') do @del/f/s/q "%a"
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2.只保留最后2个，则dir指令倒排序好可

for /f "skip=2 tokens=*" %a in ('dir /b/a-d/s/o-n') do @del/f/s/q "%a"
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