You can theoretically change user.cs_path through sysctl -w user.cs_path=/opt/local/bin:/usr/bin:/bin:/usr/sbin:/sbinīut I don't know if that is such a good idea. In general, stick to which or which -a to find a binary rather than using whereis. That explains your difference, since /opt/local/bin is not a system-wide 'standard' path-after all, MacPorts is a completely optional installation-and sysctl only has /usr/bin:/bin:/usr/sbin:/sbin in its user.cs_path per default. The which utility takes a list of command names and searches the path for each executable file that would be run had these commands actually been invoked. The path searched is the string returned by the sysctl(8) utility for the ``user.cs_path'' stringĬontrary to that, which is the tool commonly used to check where a binary is for your user's path. The mv command moves the file or folder from its old location and puts it in the new location. The whereis utility checks the standard binary directories for the specified programs, printing out the paths of any it finds. Move a file or folder locally In the Terminal app on your Mac, use the mv command to move files or folders from one location to another on the same computer. In the manpage of whereis, it clearly says (emphasis mine):

Mac commands list mv