Backup script using tar and xz for arch linux

backup.sh

#!/bin/sh

if [[ $(whoami) != "root" ]]
    then echo "Please run as root"
    exit 1
fi
if [ "$(ls /bin | grep trizen)" == "trizen" ]
then
    PKGMAN=trizen
else
    PKGMAN=pacman
fi
clear
echo "Enter the name of the directory where the backup will be stored with no trailing slash, preferably on a seperate drive"
read BDIR
DATE=$(date +%Y-%m-%d)
clear
echo "Starting backup..."
sleep 2
mkdir "${BDIR}/.temp"
mkdir "${BDIR}/.temp/pkglist"
TEMPDIR="${BDIR}/.temp"
${PKGMAN} -Q > "${TEMPDIR}/pkglist/packagelist-all"
${PKGMAN} -Qe > "${TEMPDIR}/pkglist/packagelist-explicit"
if [ "$1" == "--pac" ]
then
    bfile="${BDIR}/pacbackup-${DATE}.tar.xz"
    tar --xattrs -cpvf - "/var/lib/pacman/local" "${TEMPDIR}/pkglist" | xz -z9k --memory=70% --stdout > ${bfile}
    echo "If no errors were shown, a new backup has been created at ${BDIR}/pacbackup-${DATE}.tar.xz"
else
    bfile="${BDIR}/backup-${DATE}.tar.xz"
    tar --xattrs -cpvf - "/home" "/var" "/etc" "/boot" "${TEMPDIR}/pkglist" | xz -z9k --memory=70% --stdout > ${bfile}
    echo "If no errors were shown, a new backup has been created at ${BDIR}/backup-${DATE}.tar.xz"
fi
rm -r "${TEMPDIR}"
read