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

Success #stdin #stdout 0.03s 5348KB

stdin

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

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

stdout

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

[Section A]
$param1=value1
$param2=new_value2

https://ideone.com/PCIgU

language:

Bash (bash 5.0.3)

created:

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public

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