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[Solved] Replace first occurrence after match

 
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Top Forums UNIX for Dummies Questions & Answers [Solved] Replace first occurrence after match
# 1  
Old 01-16-2014
Question [Solved] Replace first occurrence after match
hey guys, i have been trying to work this thing out with sed with no luck Smilie
i m looking for a way to replace only the first occurrence after a match
for example :

Code:
 
Cat
Realized what you gotta do
Dog
Realized what you gotta do
Sheep
Realized what you gotta do
Wolf
Realized what you gotta do

i would like to replace the first occurrence of "you" to "us" only if the word "Sheep" appeared somewhere erailer (could be a random number of lines befor or as a part of a sentence).
so results for this thing will be :

Code:
 
Cat
Realized what you gotta do
Dog
Realized what you gotta do
Sheep
Realized what us gotta do
Wolf
Realized what you gotta do

any help will be appreciated
10x
# 2  
Old 01-16-2014
Try:
Code:
perl -0pe 's/(?<=Sheep)(.*?)you/$1us/s' file

This User Gave Thanks to bartus11 For This Post:
boaz733
# 3  
Old 01-16-2014
Try:
Code:
sed '/Sheep/,/you/s/you/us/' file

Last edited by vbe; 01-16-2014 at 10:31 AM.. Reason: typo: missing final ' ...
This User Gave Thanks to Scrutinizer For This Post:
boaz733
# 4  
Old 01-16-2014
the perl script worked perfectly, the sed script replaced all the match, and not only the first occurrence.
# 5  
Old 01-16-2014
Hello,

Following may also help.

Code:
awk '/Sheep/ && a!=1 {print;getline; sub(/you/,"us");a=1}1'  file_name

Output will be as follows.

Code:
Realized what you gotta do
Dog
Realized what you gotta do
Sheep
Realized what us gotta do
Wolf
Realized what you gotta do
Sheep
Realized what you gotta do


Thanks,
R. Singh
# 6  
Old 01-17-2014
Hi ,
Thanks all for your reply ..

I have the similar query but for my case I want add another line before that matched line (ie, Realized what you gotta do).

thanks in advance
# 7  
Old 01-17-2014
Some more awk

Code:
$ awk '!f && s{sub(old,new);f=1}/Sheep/{s=1}1' old="you" new="us" file

--edit---

Quote:
Originally Posted by arup1980
Hi ,
Thanks all for your reply ..

I have the similar query but for my case I want add another line before that matched line (ie, Realized what you gotta do).

thanks in advance

Code:
$ awk '!f && s{print newline;f=1} /Sheep/{s=1}1' newline="its my new line" file
Realized what you gotta do
Dog
Realized what you gotta do
Sheep
its my new line
Realized what you gotta do
Wolf
Realized what you gotta do

Last edited by Akshay Hegde; 01-17-2014 at 09:46 AM..
 
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