'How to send USR2 signal?

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'
linuxnginxsignals


Solution 1:[1]

First invoke kill -l to list all signals

in some destro USR2 is SIGUSR2. also you can run it by it's number

Sources

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Source: Stack Overflow

Solution Source
Solution 1 vahid abdi

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