shell读取命令行输入后，循环验证问题？

Perl_Er

标准输入变了，所以你的第二个read的输入不是STDIN，而是那个文件，所以在第二个read的时候要回复STDIN

1. -bash-3.2$ ./verification.sh
   
2. Please type for 1:
   
3. a
   
4. You are right
   
5. Please type for 2:
   
6. b
   
7. You are right
   
8. Please type for 3:
   
9. c
   
10. You are right
    
11. -bash-3.2$ cat verification.sh
    
12. #!/bin/bash
    
13. 
    
14. exec 3<&0
    
15. exec <verification.txt
    
16. exec 4<&0
    
17. while read line
    
18. do
    
19.         field1=${line%_*}
    
20.         field2=${line#*_}
    
21.         exec 0<&3
    
22.         echo "Please type for ${field1}:"
    
23.         read f2
    
24.         while [ "${f2}" != "${field2}" ]
    
25.         do
    
26.                 echo "You typed incorrectly"
    
27.                 echo "Please type for ${field1}:"
    
28.                 read f2
    
29.         done
    
30.         echo "You are right"
    
31.         exec 0<&4
    
32. done
    
33. -bash-3.2$ cat verification.txt
    
34. 1_a
    
35. 2_b
    
36. 3_c
    
37. -bash-3.2$
    

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回复 1# spouter