pbpaste in shell script

I copied a YouTube URL and tried following commands but failed:

yt-dlp | pbpaste

Then

yt-dlp $(pbpaste)

Then I tried a shell script like this:

set pb = $(pbpaste)
yt-dlp $pb
set =

Now that all these tries failed, I'm wondering what's the correct command or script.Both yt-dlp and pbpaste work well in a-Shell.