Remove all npm global packages (yes!):
npm ls -gp --depth=0 | awk -F/node_modules/ '{print $2}' | grep -vE '^(npm)$' | sudo xargs npm -g rmRemove all npm global packages (yes!):
npm ls -gp --depth=0 | awk -F/node_modules/ '{print $2}' | grep -vE '^(npm)$' | sudo xargs npm -g rm