POSIX specified way to get results you are expecting is "command -p echo", as POSIX does not guarantee where the utilities are located, on the other hand it gua

POSIX specified way to get results you are expecting is "command -p echo", as POSIX does not guarantee where the utilities are located, on the other hand it guarantees that all utilities that are implemented as shell builtins while they don't need to (eg. cd makes sense only as builtin) must also be present on filesystem.