Screening is when people are invited for a test to look for disease despite them having no symptoms.
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Exec runs a command and returns its exit code:，详情可参考一键获取谷歌浏览器下载
tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.