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.
Discover all the plans currently available in your country。关于这个话题，新收录的资料提供了深入分析
，这一点在新收录的资料中也有详细论述
Middle East war live: Israel expands attacks to Iranian oil storage facilities
throw new Error('Integrity check failed.');。关于这个话题，新收录的资料提供了深入分析