mv log-6 log-7
mv log-5 log-6
mv log-4 log-5
mv log-3 log-4
mv log-2 log-3
mv log-1 log-2
mv logactual log-1

for ((i=7; i>=2; i--)); do mv "log-$((i-1))" "log-$i"; done; mv logactual log-1
mv log-6 log-7
mv log-5 log-6
mv log-4 log-5
mv log-3 log-4
mv log-2 log-3
mv log-1 log-2
mv logactual log-1

for file in log-*
do
    lognr=$(echo $file | sed "s/log-(d*)/1/")
    mv "$file" "log-$(expr $lognr + 1)"
done
mv logactual log-1

COUNTER=7
until [  $COUNTER -gt 0 ]; do
mv log-($COUNTER -1) log-$COUNTER
let COUNTER-=1
done