Установка перехода на летнее время

echo "#!/bin/sh" >> /usr/local/sbin/pre-boot  

echo 'echo "MSK-3MSD,M3.5.0,M10.5.0/3" > /etc/TZ' >> /usr/local/sbin/pre-boot

echo 'nvram set time_zone="MSK-3MSD,M3.5.0,M10.5.0/3"' >> /usr/local/sbin/pre-boot