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How do i Replace if the pattern what I am trying to search is not fixed , like in the previous post as i have mentioned

I have to replace all flag values "N" to "Y" only for string starting with...

Hi ,
I have a doubt here
If my pattern is not fixed , like in below case then how can I do that using sed command .
I tried using awk command but it replaced N with Y in entire file.txt


awk...

Hi ,
You can do that using

if [ -f file.txt ]; then

Regards,
Haris

can you give more details and the desired output you are expecting
If possible please also paste your current shell script