I would recommand to never copy paste but retype so you have the commands on your finger memory.

Also don’t be afraid to --help everything. It give more option for commands you know quicker than the man.

Why should I use a sudo alternative?

-g is not documented, what does it do?

Note: this made me discover topless (SFW) and its Caveat section.

From your example, I have a hard time inferring what is it doing.