redirection input と pipe で readが違う
```
for w in {0..2}; do sleep $w && echo 'echo a; read b; echo $b'; done | bash
>> a
>> echo a; read b; echo $b
>> a
>>
```
```
bash <(for w in {0..2}; do sleep $w && echo 'echo a; read b; echo $b'; done)
>> a
>> input2
>> input2
>> a
>> input2
>> input2
>> a
>> input3
>> input3
```
for w in {0..2}; do sleep $w && echo 'echo a; read b; echo $b'; done | bash
>> a
>> echo a; read b; echo $b
>> a
>>
```
```
bash <(for w in {0..2}; do sleep $w && echo 'echo a; read b; echo $b'; done)
>> a
>> input2
>> input2
>> a
>> input2
>> input2
>> a
>> input3
>> input3
```
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