export OS='Gentoo'
elif [ "${SHELL#*gentoo}" != "${SHELL}" ]; then # assumes 'gentoo' in prefix
export OS='Gentoo Prefix'
+ elif grep -i '^ID=.*arch' /etc/os-release > /dev/null 2>&1; then
+ export OS='Arch'
elif grep -i debian /etc/issue > /dev/null 2>&1; then
export OS='Debian'
elif grep -i ubuntu /etc/issue > /dev/null 2>&1; then