ob1

#!/bin/sh

DAY=7
TDIR=ltmp

mkdir ${TDIR}

while [ ${DAY} -ge 0 ]; do
    mv backup-`date -d "${DAY} day ago" +%Y%m%d`.tar.gz ${TDIR}
    let DAY=${DAY}-1
done

rm -f backup-*.tar.gz
mv ${TDIR}/backup-*.tar.gz .
rmdir ${TDIR}