The problem of the pipe-CodePudding

 cat pipe. Sh 
#!/bin/bash 
Fifo_file=fifo. Pipe 
Mkfifo $fifo_file 
The exec 6 & lt;> $fifo_file 
The rm $fifo_file 

DateWrite () 
{
I=0 
While [$I lt - 1000] 
Do 
STR=` date ` 
I=$((I + 1)) 
Echo "$I $STR 
"The done 
} 

For ((I=0; i<100; I++)) 
Do 
(DateWrite & gt; & 6) & amp; 
The done 

While the read date_time 
Do 
Echo $date_time & gt;> The output. The file 
Done & lt; & 6

Two questions,
1, why the rm $fifo_file, delete the file after, does not affect the operation?
2, how to modify, make this exit program can properly?