One convention of many "Unix-style" utilities is that they often produce minimal or even no output in normal situations, and that they normally run in a "one-shot" or "batch" fashion rather than being user-interactive like the "standard C" example. There are reasons for this (such as the ease of constructing shell scripts and pipelines), but this is an idea which I originally had to learn "orally" many years ago, rather than via more-formalized written means.
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Москвичам пообещали тепло17:31。新收录的资料是该领域的重要参考
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,这一点在新收录的资料中也有详细论述
Chris, what’s next for Hasbro? What should we be looking out for?
Leaders discuss military cooperation day after US president hit out at PM over lack of immediate backing for attacks,这一点在新收录的资料中也有详细论述