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Change specific occurence with sed

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# 1  
Old 05-17-2010
Change specific occurence with sed
Hello,

I have this file.

Code:
[Batch]
aaa
port=1234
time
[Sdp]
bbb
port=2233
name
[Ivr]
ccc
port=4444
name


Is there any way with sed to change only the occurence of "port" which comes after section [sdp] to have as output :

Code:
[Batch]
aaa
port=1234
time
[Sdp]
bbb
port=6677
name
[Ivr]
ccc
port=4444
name


It means, can we say to sed, change only this expression that comes after this expression.
Else is there a way to tell sed to change for intance only the second or the third occurence of a pattern of a file.

Thanks ...
# 2  
Old 05-17-2010
Code:
$ sed "/\[Sdp\]/,/\[/ s/^port=.*/port=6677/" file1
[Batch]
aaa
port=1234
time
[Sdp]
bbb
port=6677
name
[Ivr]
ccc
port=4444
name

# 3  
Old 05-17-2010
Thx a lot for this very quick response ...

Just one thing please, how can we do this by saying to sed for instance, I want to change only the third occurence in the file ?

Thx in advance ...
# 4  
Old 05-17-2010
Probably with some difficulty.

I'd use awk for that.
# 5  
Old 05-17-2010
ok, thank you ...
# 6  
Old 05-17-2010
You're welcome!

Not so elegant, but...
Code:
awk -v N=3 '/\[/ { P = 0 } /\[Sdp\]/ { C++; P = 1 } /^port=/ && C == N && P { $0 = "port=6677" } 1' file1

(change N=3) to which ever occurrence you want...)
# 7  
Old 05-17-2010
Thx a lot ...
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