modifyINI.ps1: an INI file modification script

The next script modifies one value in one section in an INI file. The INI filename stays the same. No input validation, no backup, no fancy command line parsing, no help, no nothing...

The  regexp's are stolen from: https://devblogs.microsoft.com/scripting/use-powershell-to-work-with-any-ini-file/

<#

    Script: modifyINI.ps1

    Purpose: Change values in INI files

    Date: 20-Oct-2022

    Version: 0.1

 

    Usage: 

 

PS C:\> modifyINI.ps1 "INI file" "[Section]" "Key" "New value" 

   

    --- c:\temp\test.ini -------------------

    [System]

    Colors=256

    memSize=20MB

    cpuCores=4

    ----------------------------------------

       

    PS C:\> modifyINI.ps1 "c:\temp\test.ini" "[System]" "memSize" "35MB"

    --- c:\temp\test.ini -------------------

    [System]

    Colors=256

    memSize=35MB

    cpuCores=4

    ----------------------------------------

#>

    if ($args.count -NE 4) {Exit}

   

    $iniFile    = $args[0]

    $srcSection = $args[1]

    $srcKey     = $args[2]

    $newVal     = $args[3]

 

    $tabChr     = ""        #--- Ident for val/var lines

    $spaceChr   = ""        #--- Space before/after "=", for readability.

    $section    = $NULL

   

    $srcFile = get-content $iniFile

    $tmpFile = New-TemporaryFile

    foreach ($line in $srcFile) {

       

        $bareLine = $line.trim()

       

        if ($bareLine -MATCH "^\[(.+)\]") {             #--- [Section]...

         

            $section = $bareLine

           

        } ELSEIF ($bareLine -MATCH  "(.+?)\s*=(.*)") {  #--- key=val...

         

            $key = $bareLine.split("=")[0].trim()

            $val = $bareLine.split("=")[1].trim()

       

            if (($srcSection -EQ $section) -AND ($srcKey -EQ $key)) {

               

                $bareLine = "$tabChr$key$spaceChr=$spaceChr$newVal"

               

            } ELSE {

               

                $bareLine = "$tabChr$key$spaceChr=$spaceChr$val"

               

            }

       

        } #--- ELSE do nothing $bareLine...

       

        write-output "$bareLine" | out-file $tmpFile -append

       

    }    

   

    copy-item $tmpFile $iniFile -force

    remove-item $tmpFile -force