perl -ne 'if(s/No/Yes/){ print; last; } else {print} }{print while(<>)' user.txt

This will loop, through printing lines, and change the first one that has a No, and then just finish looping printing the lines as is.

In reply to Re: Problem changing only first occurence of pattern in file by cephas
in thread Problem changing only first occurence of pattern in file by JimJx

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