linux shell編程 兩道簡單的問題 求幫做

for i in `seq 1 10`

do

touch dir${i}/dir${i}file{1..10}

done

chmod 755 -R dir*

read -p "Please input a number [1-10]" num

[ ${num} -gt 0 ] && [ ${num} -lt 11 ] && find dir${num} -type f > log.txt

cat log.txt | xargs mv {,.bak}

find . -name *[0-9]* |xargs rm -rf