redhat9中的grep怎么不支持-p

beginner-bj

-p的作用是：对于匹配的字符串，显示整个一段，而不是只显示一行。

难道一定要用awk来实现吗？

waker

\n被定义为换行符
那么“换段符”是What?

lych

-p[ separator] separator为指定的段分隔符。
缺省的段分隔符是空白行。

beginner-bj

举个AIX下的例子吧

1. 
   
2. $ cat >1
   
3. -p[Separator] Displays the entire paragraph containing matched lines. Paragraphs
   
4. are delimited by paragraph separators, as specified by the Separator parameter,
   
5. which are patterns in the same form as the search pattern. Lines containing the
   
6. paragraph separators are used only as separators; they are never included in the
   
7. output. The default paragraph separator is a blank line.
   
8. 
   
9. -q Suppresses all writing to standard output, regardless of matching lines.
   
10. Exits with a zero status if an input line is selected. The -q flag with any
    
11. combination of the -c, -l and -n flags behaves like the -q flag only.
    
12. 
    
13. -s Suppresses error messages ordinarily written for nonexistent or unreadable
    
14. files. Other error messages are not suppressed.
    
15. 
    
16. $ grep -p delimited 1
    
17. -p[Separator] Displays the entire paragraph containing matched lines. Paragraphs
    
18. are delimited by paragraph separators, as specified by the Separator parameter,
    
19. which are patterns in the same form as the search pattern. Lines containing the
    
20. paragraph separators are used only as separators; they are never included in the
    
21. output. The default paragraph separator is a blank line.
    
22. 
    
23. $
    

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jeff_gu

用perl呀，跨平台的，多好
#perl -n00e 'print if /delimited/' 1

beginner-bj

原帖由 "jeff_gu" 发表：
用perl呀，跨平台的，多好
#perl -n00e 'print if /delimited/' 1

看来PERL是挺强的，有必要好好的学习学习

beginner-bj

旧事重提。
想问问，如果用sed或awk能否实现类似功能？

寂寞烈火

原帖由 waker 于 2005-6-3 08:21 发表
\n被定义为换行符
那么“换段符”是What?

waker

awk 'BEGIN{RS="";FS="\n"}
/delimited/ '   1

beginner-bj

谢谢waker，原来awk还可以这样用。不知道sed是不是也可以？

1. rs6000test:[/etc/security]#grep -p test passwd
   
2. test:
   
3.         password =
   
4.         lastupdate = 1143772773
   
5.         flags = ADMCHG
   
6. 
   
7. testu5:
   
8.         password =
   
9.         lastupdate = 1132876926
   
10.         flags = ADMCHG
    
11. 
    
12. test2:
    
13.         password = f2dnL3m5yVSC.
    
14.         lastupdate = 1148022485
    
15.         flags =
    
16. 
    
17. test3:
    
18.         password = Dk.ULYzf5wbGU
    
19.         lastupdate = 1148026337
    
20.         flags =
    
21. 
    
22. rs6000test:[/etc/security]#awk 'BEGIN{RS="";ORS="\n\n";FS="\n"} /test/' passwd
    
23. test:
    
24.         password =
    
25.         lastupdate = 1143772773
    
26.         flags = ADMCHG
    
27. 
    
28. testu5:
    
29.         password =
    
30.         lastupdate = 1132876926
    
31.         flags = ADMCHG
    
32. 
    
33. test2:
    
34.         password = f2dnL3m5yVSC.
    
35.         lastupdate = 1148022485
    
36.         flags =
    
37. 
    
38. test3:
    
39.         password = Dk.ULYzf5wbGU
    
40.         lastupdate = 1148026337
    
41.         flags =
    
42. 
    
43. rs6000test:[/etc/security]#

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