How to send USR2 signal?

Question

I read that to upgrade nginx involves among other things sending the `USR2` signal with `kill -USR2 pid`. So I tried `sudo kill -USR2 3049` but got ``` $ sudo kill –USR2 3049 kill: failed to parse argument: '–USR2' ```

Accepted Answer

I was copy pasting from a website and that caused the wrong dash to be used.

```
sudo kill –USR2 3049
```

vs the correct dash (hypen):

```
sudo kill -USR2 3049
```

How to send USR2 signal?

Solution

Problem