Question

3

rated 0 times [ 3] [ 0] / answers: 1 / hits: 526 / 3 Years ago, sat, october 2, 2021, 4:55:04

I have this input file:

text1

match

text2

match

text3

And I have this command:

perl -lpe 'print "prepend_me" if /^match$/' text.txt

And its output is:

text1

prepend_me

match

text2

prepend_me

match

text3

But I want:

text1

prepend_me

match

text2

match

text3

How do I get this?

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answered 3 Years ago istictroubli · Accepted Answer

Just count how often it got already matched and prefix it only on the first match:

perl -lpe 'print "prepend_me" if /^match$/ && ++$count == 1' text.txt