一个用python写的脚本，在本地测试的时候用python的print输出了一些状态信息，用于观测程序运行的状况。脚本自身比较耗时（中间故意设置了延时）。
在部署到服务器上后，需要后台运行，因此就想当然的转向输出到一个文本log中：
python script.py > output.log &
结果发现log文件一直是空白（程序在持续运行中），但正常应该是有文本记录的。结果网上搜索才发现，python脚本默认是在脚本整个执行完成后才输出的。（参考：https://unix.stackexchange.com/questions/182537/write-python-stdout-to-file-immediately/182542#182542）
当然，知道问题后解决方案也很简单：
python -u script.py > output.log &
shell下python脚本的输出转向
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《 “shell下python脚本的输出转向” 》 有 13 条评论
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