如何在分组文本中提取固定和不固定位置信息？

xxinganling

有文本部分内容如下：
$ cat conf.txt
....

#
interface LoopBack600
description to-lb600
ip address 192.168.2.45 255.255.255.255
#
interface LoopBack800
  to-lb800
ip address 172.18.32.96 255.255.255.255
#
#
interface Vlan-interface634
description TO-unit34
ip address 192.168.1.66 255.255.255.252
ospf cost 200
ospf network-type p2p
ospf bfd enable
#
#
interface FastEthernet 0/30
no switchport
ip ospf network point-to-point
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 7 141a46076330240c541752
ip ospf cost 50
no ip proxy-arp
ip address 192.168.6.32 255.255.255.252
description Connect_to_unit30
#
....

要从文本中提取含有“ip address”的行所在的一组文本（以#号区隔）的字头（FastEthernet 0/30等）、IP地址（ip address）和描述信息（description），输出以逗号区隔的如下文本：
LoopBack600,192.168.2.45,to-lb600
LoopBack800,172.18.32.96,to-lb800
Vlan-interface634,192.168.1.66,TO-unit34
FastEthernet 0/30,192.168.6.32,Connect_to_unit30
...
研究了好长时间，因为每组数的行数不固定，要取得信息除了字头外其他两项所在行的位置也不固定，没能实现。请论坛里的高手帮忙，谢谢！

a5love3n

1. awk '/interface/{if(b){print a","b","c;b=c=""};a=$2" "$3}/ip address/{b=$3}/description/{c=$2}END{print a","b","c}' 1.txt

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to-lb800这一行缺少 description，我才是你复制漏了，如果不是，那就不好处理了，因为description信息是管理员自定义的，没有特征

效果如下

LoopBack600 ,192.168.2.45,to-lb600
LoopBack800 ,172.18.32.96,to-lb800
Vlan-interface634 ,192.168.1.66,TO-unit34
FastEthernet 0/30,192.168.6.32,Connect_to_unit30

因为 interface FastEthernet 0/30 接口和其他接口格式不一样，为了兼顾，会导致 LoopBack600 ,这里的逗号前面多一个空格，介意的话，再用sed或者vim处理一下就行了

xxinganling

回复 2# a5love3n

谢谢a5love3n !!!
脚本完全合适！我以为要重置FS为#后再配置各行，但没做成。您的这种连续匹配的方法我还是头一回见到，有对应的术语或相关的资料推荐吗？再次感谢 a5love3n ！！！


另外，确实是丢了 description 字段。完整文件如下：
#
interface LoopBack600
description to-lb600
ip address 192.168.2.45 255.255.255.255
#
interface LoopBack800
description to-lb800
ip address 172.18.32.96 255.255.255.255
#
#
interface Vlan-interface634
description TO-unit34
ip address 192.168.1.66 255.255.255.252
ospf cost 200
ospf network-type p2p
ospf bfd enable
#
#
interface FastEthernet 0/30
no switchport
ip ospf network point-to-point
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 7 141a46076330240c541752
ip ospf cost 50
no ip proxy-arp
ip address 192.168.6.32 255.255.255.252
description Connect_to_unit30
#

a5love3n

回复 3# xxinganling

专业术语和资料我还真不知道，我是个半桶水，我的awk就是在这里刷帖子学的，主要学习对象就是版主 wh7211 对各种问题的解决

wh7211

回复 1# xxinganling
回复 2# a5love3n


这样定义变量a，逗号前面就没有空格了。

1. cat 1
   
2. #
   
3. interface LoopBack600
   
4. description to-lb600
   
5. ip address 192.168.2.45 255.255.255.255
   
6. #
   
7. interface LoopBack800
   
8. description to-lb800
   
9. ip address 172.18.32.96 255.255.255.255
   
10. #
    
11. #
    
12. interface Vlan-interface634
    
13. description TO-unit34
    
14. ip address 192.168.1.66 255.255.255.252
    
15. ospf cost 200
    
16. ospf network-type p2p
    
17. ospf bfd enable
    
18. #
    
19. #
    
20. interface FastEthernet 0/30
    
21. no switchport
    
22. ip ospf network point-to-point
    
23. ip ospf authentication message-digest
    
24. ip ospf message-digest-key 1 md5 7 141a46076330240c541752
    
25. ip ospf cost 50
    
26. no ip proxy-arp
    
27. ip address 192.168.6.32 255.255.255.252
    
28. description Connect_to_unit30
    
29. #
    
30. 
    
31. awk '/^interface/{if(a&&b&&c){print a","b","c};a=b=c="";a=gensub($1" ","","1",$0)}/^ip address/{b=$3}/^description/{c=$2}END{if(a&&b&&c){print a","b","c}}' 1
    
32. LoopBack600,192.168.2.45,to-lb600
    
33. LoopBack800,172.18.32.96,to-lb800
    
34. Vlan-interface634,192.168.1.66,TO-unit34
    
35. FastEthernet 0/30,192.168.6.32,Connect_to_unit30

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