【shell】shell数组的操作（定义、索引、长度、获取、删除、修改、拼接）

arr=("apple" "banana" "orange" "grape")

arr=("apple" "banana" "orange" "grape")
echo ${arr[0]} # 输出 apple
echo ${arr[2]} # 输出 orange

arr=("apple" "banana" "orange" "grape")
echo ${#arr[@]} # 输出 4

arr=("apple" "banana" "orange" "grape")
echo ${arr[@]} # 输出 4

for i in "${arr[@]}"
do
  echo $i
done

arr=("apple" "banana" "orange" "grape")
arr[1]="pear"
echo ${arr[1]} # 输出 pear

arr=("apple" "banana" "orange" "grape")
unset arr[2]
echo ${arr[@]} # 输出 apple pear grape

arr1=("apple" "banana")
arr2=("orange" "grape")
arr=("${arr1[@]}" "${arr2[@]}")
echo ${arr[@]} # 输出 apple banana orange grape