请教sed删除换行符的方法

我是DBA

你的是三行并为一行,比较特殊,要多加一个N;
[test@ ~ ] $ sed 'N;N;s/\n/-_-/' 1
gei_1/1 is up,  line protocol is up-_-  Interface utilization: input      14%,     output       9%

gei_1/2 is down,  line protocol is down-_-  Interface utilization: input       0%,     output       0%突然

gei_1/3 is up,  line protocol is up-_-  Interface utilization: input       10%,     output       10%

linuxboy823

N的具体意思是什么啊
`N'
     Add a newline to the pattern space, then append the next line of
     input to the pattern space.  If there is no more input then `sed'
     exits without processing any more commands

没有理解！

我是DBA

N的意思就是把下一行追加到当前行尾

wtuter

仔细看看man sed,看看sed是怎样读文件的

haimming

我想“我是DBA”这小子今天不是在泡妞就是给妞泡晕了
再不就是给人盗号了，完全不像他的风格

1. 
   
2. $ cat >aa
   
3. gei_1/1 is up,  line protocol is up
   
4.   Interface utilization: input      14%,     output       9%
   
5. 
   
6. gei_1/2 is down,  line protocol is down
   
7.   Interface utilization: input       0%,     output       0%突然
   
8. 
   
9. gei_1/3 is up,  line protocol is up
   
10.   Interface utilization: input       10%,     output       10%
    
11. 
    
12. Administrator@ad85992220194fe ~
    
13. $ sed '/is down\|is up/{N;s/\n//}' aa
    
14. gei_1/1 is up,  line protocol is up  Interface utilization: input      14%,
    
15. output       9%
    
16. 
    
17. gei_1/2 is down,  line protocol is down  Interface utilization: input       0%,
    
18.     output       0%突然
    
19. 
    
20. gei_1/3 is up,  line protocol is up  Interface utilization: input       10%,
    
21. output       10%
    
22. 
    
23. Administrator@ad85992220194fe ~
    

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linuxboy823

那又为什么要用2个N才能实现呢？

我是DBA

两个N就把下面两行都搞上来。

gqkkk

sed -e :a -e 'N;s/\n//;ta'


: label
              Label for b and t commands.


Commands which accept address ranges
       {      Begin a block of commands (end with a }).

       b label
              Branch to label; if label is omitted, branch to end of script.

       t label
              If a s/// has done a successful substitution since the last input line was read and since the last t or T command, then branch to label; if label is omitted, branch to    end of script.

       T label
              If no s/// has done a successful substitution since the last input line was read and since the last t or T command, then branch to label; if label is  omitted,  branch    to end of script.

[ 本帖最后由 gqkkk 于 2009-5-14 14:37 编辑 ]

greendays

[root@Greendays lianshou]# cat b
1
2
3
4
5
6
7
8
9
0
[root@Greendays lianshou]# sed 'N;N;s/\n/\t/' b
1       2
3
4       5
6
7       8
9
0
这是怎么回事？你的bash 是那个版本的？

royzs

1. tr -d '\n'

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