[Shell] 分隔字符串為數組

#!/bin/bash
tmp="test,girl,boy,love"


OLD_IFS="$IFS"
IFS="," 
arr=($a)
IFS="$OLD_IFS"

echo "arr[0] is:  ${arr[0]}"

echo "arr len:  ${#arr[@]}"

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

存儲老的分隔符
OLD_IFS="$IFS" 設置分隔符 IFS="," 
按着分隔符IFS自動分隔 
arr=($a)

分隔后的全部數組
${arr[@]}

分隔后的每一項
${arr[0]} ${arr[1]} ...

分割后的數組長度
${#arr[@]} 

存儲整個索引值
${!arr[@]}