Exec runs a command and returns its exit code:
「software armageddon（软件末日）」——这是外媒描述过去几个月软件板块遭遇时用的词。Anthropic 每推出一个新工具，市场就会条件反射式地先问一遍：又有哪些软件要被干掉？然后果断抛售手里的股票。。51吃瓜对此有专业解读
// block: Wait for space (unbounded pending queue)。业内人士推荐同城约会作为进阶阅读
最直观的是营销成本失控。完美日记的增长高度依赖营销投放，营销费用率常年居高不下，甚至一度超过 60%。随着小红书、抖音等平台流量成本逐年攀升，获客成本成倍上涨，烧钱换增长的模式在资本退潮、市场冷静的背景下，失去了可持续性。
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