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How to change ip using awk or sed .

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# 1  
Old 02-20-2008
How to change ip using awk or sed .
How to change ip using awk or sed .
#cat /etc/hosts
10.151.5.1 server1
10.151.5.2 server2
10.151.5.3 server3
10.151.5.4 server4
10.151.5.5 server5

Output:
10.151.5.1 server1
10.181.5.2 server2
10.151.5.3 server3
10.181.5.4 server4
10.181.5.5 server5
# 2  
Old 02-20-2008
why don't you just edit the file manually ?
# 3  
Old 02-20-2008
ya, I would also suggest to do that manually, as your replace requirement is not consistent.

If you want all 151's in 2nd field to be 181, then

Code:
$ awk 'BEGIN{OFS=FS="."}$2==151{$2=181}{print}' hosts
10.181.5.1 server1
10.181.5.2 server2
10.181.5.3 server3
10.181.5.4 server4
10.181.5.5 server5

//Jadu
# 4  
Old 02-20-2008
Its just an example, for instance you have lots of servers' you want to edit what's in your list.

Ok how can you edit just server3 only? Not all just one. Can you do that?
# 5  
Old 02-20-2008
small modification on Jadu's awk command will do.

awk '/server3/ BEGIN{OFS=FS="."}$2==151{$2=181}{print}' hosts

this should be fine
# 6  
Old 02-20-2008
it doesnt work .it will change all,
# 7  
Old 02-20-2008
awk 'BEGIN{OFS=FS="."} /server3/ { if($2==151) {$2=181}} {print}' hosts


try this
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