Hi there,
I have been trying to install Iperf but towards the end I always get this 
message but not sure how to proceed. Thanks for any help/hint.

% brew install iperf3
Running `brew update --auto-update`...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).

Error: Failed to link all completions, docs and manpages:
  Permission denied @ rb_file_s_symlink - 
(../../../Homebrew/completions/zsh/_brew, 
/usr/local/share/zsh/site-functions/_brew)
Error: The following directories are not writable by your user:
/usr/local/share/zsh
/usr/local/share/zsh/site-functions

You should change the ownership of these directories to your user.
  sudo chown -R $(whoami) /usr/local/share/zsh 
/usr/local/share/zsh/site-functions

And make sure that your user has write permission.
  chmod u+w /usr/local/share/zsh /usr/local/share/zsh/site-function


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