Terminal applications have a “cursor” that they can move around, just like a text editor. You can tell that cursor “go to line 3, delete everything, then print out this new text” by using VT100 sequences. And you can use it to replace existing characters with new ones, without re-emitting a whole line.
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4.3 使用 crond 定时任务来检查anqicms的运行状态，详情可参考爱思助手下载最新版本
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