- 感叹号的使用
aaa=123
bbb=aaa
echo $bbb
echo ${!bbb}
- eval的使用
aaa=123
bbb=aaa
echo $bbb
eval ccc=${$bbb}
echo $ccc
- 输出结果都是下面的情况:
aaa
123
aaa=123
bbb=aaa
echo $bbb
echo ${!bbb}
aaa=123
bbb=aaa
echo $bbb
eval ccc=${$bbb}
echo $ccc
aaa
123