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perl -pe '$f=1 if(/\[Section B\]/);s/^\$param2=value2$/\$param2=new_value2/ if($f);'

Success #stdin #stdout 0.02s 5348KB

stdin

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[Section A]
$param1=value1
$param2=value2

[Section B]
$param1=value1
$param2=value2
$param3=value3

stdout

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[Section A]
$param1=value1
$param2=value2

[Section B]
$param1=value1
$param2=new_value2
$param3=value3

https://ideone.com/5YoAi

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Bash (bash 5.0.3)

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public

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