They are shell-specific, yes. Fish also has it built-in. Try man -a {pushd,popd} you can also use the man -k flag to find manpages, and see man man (or man --h

They are shell-specific, yes. Fish also has it built-in. Try man -a {pushd,popd} you can also use the man -k flag to find manpages, and see man man (or man --help) for more flags.