如何将grep找到的显示行和之前的两行内容内容过滤掉？

djzhangxing

原文本

1. 
   
2. [root@test]#cat file
   
3. Trying 220.181.112.244...
   
4. Connected to 220.181.112.244.
   
5. Escape character is '^]'.
   
6. Trying 8.8.8.8...
   
7. Trying 220.181.138.29...
   
8. Connected to 220.181.138.29.
   
9. Escape character is '^]'.
   
10. Trying 220.181.138.29...
    
11. 
    
12. #################
    
13. #我想的结果
    
14. [root@test]#cat result
    
15. Trying 8.8.8.8...
    
16. Trying 220.181.138.29...
    

复制代码

这个结果是我写的一个脚本，来判断端口是否存活。grep -B 能显示找到的当前行和指定的前几行（如下文第一个结果），但是这些是我想过滤掉的，我用grep -Bv 、grpe -FvB都不行，该如何过滤掉呢？

1.                   ###这些内容是代表端口存活，我想过滤掉
   
2. [root@test]#cat file|grep -B 2 '\]'
   
3. Trying 220.181.112.244...
   
4. Connected to 220.181.112.244.
   
5. Escape character is '^]'.
   
6. --
   
7. Trying 220.181.138.29...
   
8. Connected to 220.181.138.29.
   
9. Escape character is '^]'.
   
10. 
    
11. [root@test]#cat file|grep -vB 2 '\]'                ###没效果
    
12. Trying 220.181.112.244...
    
13. Connected to 220.181.112.244.
    
14. Escape character is '^]'.
    
15. Trying 8.8.8.8...
    
16. Trying 220.181.138.29...
    
17. Connected to 220.181.138.29.
    
18. Escape character is '^]'.
    
19. Trying 220.181.138.29...
    
20. 
    
21. [root@test]#cat result.log |grep -FvB 2 '\]'    ###没效果
    
22. Trying 220.181.112.244...
    
23. Connected to 220.181.112.244.
    
24. Escape character is '^]'.
    
25. Trying 8.8.8.8...
    
26. Trying 220.181.138.29...
    
27. Connected to 220.181.138.29.
    
28. Escape character is '^]'.
    
29. Trying 220.181.138.29...
    
30. 
    
31. [root@test]#cat file|grep -Bv 2 '\]'               ###不支持
    
32. grep: v: invalid context length argument
    
33. 
    

复制代码

我自己写的测试端口脚本如下，(指定IP，指定端口)如果需要参考，有问题，望指导哈。

1. 
   
2. [root@test]#cat port.sh
   
3. #!/bin/bash
   
4. cat /dev/null >file
   
5. while read ip port
   
6. do
   
7. (telnet $ip $port <<EOF >>/root/zx/test/file)>/dev/null 2>&1
   
8. quit
   
9. EOF
   
10. done<ip.txt
    
11. 
    
12. [root@test]#cat ip.txt                #第一列IP，第二列port
    
13. 220.181.112.244 80
    
14. 8.8.8.8 80
    
15. 220.181.138.29 80
    
16. 220.181.138.29 808
    

复制代码

ly5066113

回复 1# djzhangxing


try:

1. #! /bin/bash
   
2. 
   
3. while read line
   
4. do
   
5.         nc -w 10 -z $line > /dev/null 2>&1
   
6.         if [ $? -eq 0 ]
   
7.         then
   
8.                 echo "$line : OK"
   
9.         else
   
10.                 echo "$line : FAIL"
    
11.         fi
    
12. done < ip.txt > file

复制代码

yinyuemi

回复 1# djzhangxing


    sed 'H;/]/{x;s/\(\n[^\n]\+\)\{2\}\n[^\n]\+$//;h};${x;s/\n//p};d'

chengchow

1. sed -rn '/Trying/{N;/Trying.*Trying/p}' file
   
2. Trying 8.8.8.8...
   
3. Trying 220.181.138.29...
   

复制代码

djzhangxing

灰常感谢，新学个方式，不交互的简单些。刚刚看了一个帖子，贴上！！给大家和自己留着记录

Linux下利用nc命令来监控检测服务器的端口使用情况
http://huangrs.blog.51cto.com/2677571/967512/
回复 2# ly5066113


   

djzhangxing

好多哈，正则微弱，我仔细看看，谢谢！回复 3# yinyuemi


   

djzhangxing

回复 4# chengchow


   

聆雨淋夜

nc -v -w2 8.8.8.8
w2表示连接2秒后中断