这个awk程序结尾的-是什么意思？

least123

结尾的-没有还不行，但不知道是什么意思，网上查不到，求惑

1. awk '# lookup -- reads local glossary file and prompts user for query
   
2. 
   
3. #0
   
4. BEGIN { FS = "\t"; OFS = "\t"
   
5.         # prompt user
   
6.         printf("Enter a glossary term: ")
   
7. }
   
8. 
   
9. #1 read local file named glossary
   
10. FILENAME == "glossary" {
    
11.         # load each glossary entry into an array
    
12.         entry[$1] = $2
    
13.         next
    
14. }
    
15. 
    
16. #2 scan for command to exit program
    
17. $0 ~ /^(quit|[qQ]|exit|[Xx])$/ { exit }
    
18. 
    
19. #3 process any non-empty line
    
20. $0 != "" {
    
21.         if ( $0 in entry ) {
    
22.                 # it is there, print definition
    
23.                 print entry[$0]
    
24.         } else
    
25.                 print $0 " not found"
    
26. }
    
27. 
    
28. #4 prompt user again for another term
    
29. {
    
30.         printf("Enter another glossary term (q to quit): ")
    
31. }' glossary -
    

复制代码

blackold

回复 1# least123


    stdin

least123

感谢！原来这个是shell中的。学习了