📅  最后修改于: 2022-03-11 14:50:46.030000             🧑  作者: Mango
You want to use backtick not regular tick:
sudo kill -9 `sudo lsof -t -i:9001`
If that doesn't work you could also use $() for command interpolation:
sudo kill -9 $(sudo lsof -t -i:9001)