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比如 { time mysqldump > bak.sql; } 2> t.txt
mysqldump 一定要写绝对路径， 否则，bak.sql是空的。
It seems that your environment variables are wrong. Use env | grep PATH to check whether the paths corresponding to time mysqldump and other commands are in your PATH
Do you need an absolute path to run mysqldump normally?
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
It seems that your environment variables are wrong. Use env | grep PATH to check whether the paths corresponding to time mysqldump and other commands are in your PATH
Do you need an absolute path to run mysqldump normally?