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Change specific ip address in a file

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# 1  
Old 04-22-2010
Change specific ip address in a file
I need to change a line from a xen cfg file using sed if it's possible. The original line is:

Code:
vif         = [ 'ip=123.456.789.123,mac=00:16:3E:7D:16:BF,vifname=veth107', 'ip=10.1.10.4,vifname=veth107a' ]

I want to change ONLY the IP address of the second part ==> ip=10.1.10.4 to another IP --> ip=192.222.11.6 The first one ip=123.456.789.123 keeps untouchable.

My new line shoud be like this now:

Code:
vif         = [ 'ip=123.456.789.123,mac=00:16:3E:7D:16:BF,vifname=veth107', 'ip=192.222.11.6,vifname=veth107a' ]

Can you help me?

thanks in advance.
regards
Israel
Last edited by zaxxon; 04-22-2010 at 10:48 AM.. Reason: use code tags please, ty
# 2  
Old 04-22-2010
Try this if the ip address occurs only once in the file:
Code:
sed 's/ip=10.1.10.4/ip=192.222.11.6/' file

# 3  
Old 04-22-2010
Tools
Arrrr, this is a very very dirty hack:
Code:
$ cat myconf
vif         = [ 'ip=123.456.789.123,mac=00:16:3E:7D:16:BF,vifname=veth107', 'ip=10.1.10.4,vifname=veth107a' ]
$ 
$ cat myconf | sed ''/ip=10.1.10.4,v/s//ip=192.222.11.6,v/'' > myconf
$ 
$ cat myconf
vif         = [ 'ip=123.456.789.123,mac=00:16:3E:7D:16:BF,vifname=veth107', 'ip=192.222.11.6,vifname=veth107a' ]
$

# 4  
Old 04-22-2010
opss, sorry guys...

I forgot to say about the value I want to change... ip=10.1.10.4 is a random ip, I just want to change the original random value to other random value too...

I mean, change the second part of value ip=un.known.ip.add to ip=other.ip.add.ress

Am I asking too much? :-)

regards
Israel.
# 5  
Old 04-22-2010
i'd do it with perl:

Code:
perl -i -ne's/(ip=.+)(ip=.+?,)/$1ip=new.ip.address,/;print'



---------- Post updated at 02:13 PM ---------- Previous update was at 02:12 PM ----------

sorry forgot to include the filename at the end:

Code:
perl -i -ne's/(ip=.+)(ip=.+?,)/$1ip=new.ip.address,/;print' file

Last edited by Scott; 04-22-2010 at 04:33 PM.. Reason: Code tags...
# 6  
Old 04-22-2010
very nice rugdog:

What if I need to remove that new ip entry I already changed the way you said? I want this output now:


Code:
vif         = [ 'ip=123.456.789.123,mac=00:16:3E:7D:16:BF,vifname=veth107', 'vifname=veth107a' ]

really appreciate your help
regards
Israel.
Last edited by Scott; 04-23-2010 at 05:58 PM.. Reason: Code tags, please...
# 7  
Old 04-22-2010
that would be:

Code:
perl -i -ne's/(ip=.+)(ip=.+?,)/$1/;print' file

be aware that the "-i" option is the in-place edit option of perl, that means that the file is modified right away when you run the script.
Last edited by Scott; 04-23-2010 at 05:58 PM.. Reason: Code tags, please...
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