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.
Получившая тяжелые ранения при атаке дрона на автобус россиянка высказалась о целях ВСУ08:54，详情可参考新收录的资料
。新收录的资料对此有专业解读
Ruling could free $175bn, but legal hurdles and higher costs have left businesses questioning if claims are even worth it
Chapter 3: Types and Operators。业内人士推荐新收录的资料作为进阶阅读