quesera's reply points-out just how bad it is, but even for just 775 root:admin I would have to use sudo (plus edit the sudoers or /usr/bin/login -p first) anyw

quesera's reply points-out just how bad it is, but even for just 775 root:admin I would have to use sudo (plus edit the sudoers or /usr/bin/login -p first) anyway: $ /usr/bin/env -i /bin/sh -c \ 'id | grep -lw admin >/dev/null && echo admin || echo non-admin' non-admin The problem is I have no problem using sudo, but homebrew does (like it wants make all to happen as me).