How to silence cron?

[Per olof Ljungmark]

On 2020-09-11 16:39, tech-lists wrote:
> On Fri, Sep 11, 2020 at 03:32:40PM +0100, RW via freebsd-questions wrote:
>> On Fri, 11 Sep 2020 16:22:22 +0300
>> xtouqh at mm.st wrote:
>>
>>
>>> crontab(5) describes -n, which will silence only the successful runs,
>>> i.e:
>>>
>>> */5 * * * * -n su -m www -c "...."
>>
>>
>> Where does it say that in crontab(5)?
> 
> man 5 crontab[1], a couple of pages down:
> 
> [...]
> 
>      The following command options can be supplied:
> 
>       -n      No mail is sent after a successful run.  The execution output
>               will only be mailed if the command exits with a non-zero exit
>               code.  The -n option is an attempt to cure potentially 
> copious
>               volumes of mail coming from cron(8).
> 
>       -q      Execution will not be logged.
> 
> [...]
> 
> [1] FreeBSD 13.0-CURRENT #0 r365391M: Tue Sep  8 23:06:14 BST 2020

This is 11-STABLE, it's got -n but not -q.

Thank you all for answering. However, when I try
*/5 * * * * -n su -m www -c "...."

I get "/bin/sh: -n: not found"
More quotes?