man -k and apropos cannot find pages in section 3 in Catalina
Saw a handy shell trick posted in Apple Discussions to get rid of the hundreds of error messages whenever doing a man -k or apropos type inquiry:

apo() { apropos "$@" 2&gt; /dev/null; }

myman() { man "$@" 2&gt; /dev/null; }


See https://discussions.apple.com/thread/250812698 for the discussion.