Someone

#this is located at /usr/bin/gentoo32 on 64 bit installation

linux32 chroot /mnt/gentoo32 /usr/bin/g32start

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#this is located at /mnt/gentoo32/usr/bin/g32start in teh 32 bit installation

#!/sbin/runscript

linux32 chroot /mnt/gentoo32 /bin/bash
sleep 3
source /etc/profile
env-update
echo "You are in 32 bit mode... W00t"