Understanding "help" command description syntax - explanation needed

[cl at isbd.net]

Darren Chen <ccylily1314 at gmail.com> wrote:
> 在 2014年11月5日星期三UTC+8下午8时17分11秒，Larry.... at gmail.com写道：
> > On Wed, Nov 5, 2014 at 7:13 AM, Ivan Evstegneev <webmailgroups at gmail.com> wrote:
> > > Firtst of all thanks for reply.
> > >
> > >>>brackets [] means that the argument is optional.
> > >
> > > That's what I'm talking about (asking actually), where do you know it from?
> > 
> > I know it because I've been a programmer for 39 years.
> 
> that's awesome！！

Well I started in 1971 or thereabouts.

-- 
Chris Green
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