Powershell script to search and replace text in a file using two columns in a separate reference file - powershell

Question

I want a script that can help me check for the name of keyset (column a) in Sample.cvs and then replace the current command(column b) with new command (column c) in the Source text file.
CSV file: Sample.csv
A. | B. | C.
Manock | 2B | 2ab
Sterling | 3F | 3sf
Source file text: Source.txt
keyset "Manock"
(
key("SELECT")
command ("display/app=%disapp% "2B")
);
So desired output:
keyset "Manock"
(
key("SELECT")
command ("display/app=%disapp% "2ab")
);
Powershell Script:
New-Item -Path "C:\Users\e076200\Desktop\ks_update\source.txt" -ItemType File -Force
$data = Get-Content C:\Users\e076200\Desktop\ks_update\source.ddl
Add-Content -Value $data -Path "C:\Users\e076200\Desktop\ks_update\source.txt"
$foundline = $false
$a = 0
$Etxt = foreach($line in Get-Content C:\Users\e076200\Desktop\ks_update\source.txt)
{
if ($line -match 'keyset "Manock"' )
{
$a = 0
$foundline = $true
}
$a= $a + 1
if($line -match "display/app" -and $a -eq 5 -and $foundline -eq $true)
{
$line = $line.replace('2b' , '2ab')
$line
}
else
{
$line
}
}
$Etxt | Set-Content C:\Users\e076200\Desktop\ks_update\source.txt -Force
$users = Import-CSV -Path:\Users\e076200\Desktop\ks_update\sample.csv
I've figured out how to find and replace one line in the file directly. I've also figured out how to import the csv. I need help on how to make the logic parameterized and use column A of CSV as the match piece and column c as the replacement piece.
Script Explanation.
New-Item -Path "C:\Users\e076200\Desktop\ks_update\source.txt" -ItemType File -Force
New-Item creates new text file # location defined by -Path using name specified at the end, source.
ItemType to define type of document, -Force is force command.
$data = Get-Content C:\Users\e076200\Desktop\ks_update\source.ddl
Retrieves ddl and stores in variable.
Add-Content -Value $data -Path "C:\Users\e076200\Desktop\ks_update\source.txt"
Transfers content from variable to new text file created.
$foundline = $false
conditional variable defined for when keyset identifier is found.
$a = 0
counter defined for if statement.
$Etxt = foreach($line in Get-Content C:\Users\e076200\Desktop\ks_update\source.txt)
$Etxt - for loop
$line - variable for each line in txt
{
if ($line -match 'keyset "Manock"' )
{
$a = 0
$foundline = $true
}
If keyset identifier is found, set counter to 0 and set conditional variable to true
$a= $a + 1
if($line -match "display/app" -and $a -eq 5 -and $foundline -eq $true)
{
$line = $line.replace('2b' , '2ab')
$line
Match found, PS runs logic, line with keyset identifier == 0 + 1....up until line = 5 where we find item to be replaced.
For redundancy, line reader set to check for line identifier, ("display/app") on expected line.
If Redundant check if met and counter is 5 then we replace word with the line.replace function.
Overwritten data is returned in $line
}
else
{
$line
}
Else retain line
}
$Etxt | Set-Content C:\Users\e076200\Desktop\ks_update\source.txt -Force
Updated text file
$users = Import-CSV -Path:\Users\e076200\Desktop\ks_update\sample.csv
Imports Reference csv file
Please make explanation as dumbed down as possible. Thank you.