How to kill a process on a port on ubuntu

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)

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)