shell作业（二）

file=/etc/shadow
num=`wc -l < $file`
for i in `seq $num`
do
   arr[$i]=`head -$i $file | tail -1`
done
for i in ${arr[*]}
do
  echo $i
done

declare -A shells 
while read line 
do 
  type=`echo $line | cut -d: -f7`
  let shells[$type]++
done < /etc/passwd
for i in ${!shells[*]}
do
  echo "$i : ${shells[$i]}"
done

declare -A array
num=`find /shell/day* -type d | wc -l`
for ((i=0;i<$num;i++))
do
  type=`find /shell/day* -type d | head -$[$i+1] | tail -1`
  array[$type]=`find $type -type f -print | wc -l`
done
for i in ${!array[*]}
do
  echo " $i : ${array[$i]}"
done