Need to compare only specific lines

MVP

Sep 08, 2022

VinayNaguru I made a very simple compare

$file1 = get-content .\file1.txt
$file2 = get-content .\file2.txt
$contentsfile1 = @()

foreach ($line in $file1) {
    if ($line.StartsWith('#')) {
        #Skip
    }
    else {
        if ($line.Contains('=')) {
            $contentsfile1 += $line
        }
    }
}

foreach ($value in $contentsfile1) {
    if (-not ($file2 | Select-String $value)) {
        $found = $file2 | Select-String $value.Split('=')[0] | Select-String -Pattern '#' -NotMatch
        write-host ("{0} not found, value found is {1}" -f $value, $found) -ForegroundColor Red
    
    }
}

Contents file 1

# This parameter defines whether to use CORS filter on Auth server security filter chain.
# This parameter can only be set during initialization.
#
# Default=true
#
# auth.enable.corsfilter=true
auth.enable.corsfilter=false

# This parameter defines the number of days that a user can keep a password before it is expired
# This parameter can only be set during initialization.
#
# Default=60
#
# auth.password.expiration.days=60
auth.password.expiration.days=30

# This parameter defines the number of previous passwords that cannot be used for a new password.
# This parameter can only be set during initialization.
#
# Default=1
#
# auth.password.history.size=1
auth.password.history.size=2

Contents File 2

# This parameter defines whether to use CORS filter on Auth server security filter chain.
# This parameter can only be set during initialization.
#
# Default=true
#
# auth.enable.corsfilter=true
auth.enable.corsfilter=true

# This parameter defines the number of days that a user can keep a password before it is expired
# This parameter can only be set during initialization.
#
# Default=60
#
# auth.password.expiration.days=60
auth.password.expiration.days=60

# This parameter defines the number of previous passwords that cannot be used for a new password.
# This parameter can only be set during initialization.
#
# Default=1
#
# auth.password.history.size=1
auth.password.history.size=1

Output on screen:
auth.enable.corsfilter=false not found, value found is auth.enable.corsfilter=true
auth.password.expiration.days=30 not found, value found is auth.password.expiration.days=60
auth.password.history.size=2 not found, value found is auth.password.history.size=1

VinayNaguru
Copper Contributor
Sep 08, 2022
Hi Harm_Veenstra,

Wow. Let me try the scenario. Thank you so much for help me.
- Harm_Veenstra
  MVP
  Sep 08, 2022
  Let us know the results 🙂

LainRobertson

Silver Contributor

Sep 08, 2022

VinayNaguru Harm_Veenstra

I went for something a little more complex. May be overkill for this scenario but here it is anyway.

function Get-FileDifferences([string]$SourceFile, [string]$TargetFile)
{
    if ((Test-Path -Path $SourceFile) -and (Test-Path -Path $TargetFile))
    {
        $TargetHashes = [System.Collections.Generic.Dictionary[[int], [string]]]::new();

        # Read the target file first.
        Get-Content -Path $TargetFile |
            ForEach-Object {
                if (-not [string]::IsNullOrWhiteSpace($_) -and -not $_.Replace(" ", "").StartsWith("#") -and -not $TargetHashes.ContainsKey(($Hash = $_.GetHashCode())))
                {
                    $null = $TargetHashes.Add($Hash, $_);
                }
            }

        # Read the source file and prune matching items as we go, while reporting any differences.
        Get-Content -Path $SourceFile |
            ForEach-Object {
                if (-not [string]::IsNullOrWhiteSpace($_) -and -not $_.Replace(" ", "").StartsWith("#"))
                {
                    if ($TargetHashes.ContainsKey(($Hash = $_.GetHashCode())))
                    {
                        $null = $TargetHashes.Remove($Hash);
                    }
                    else
                    {
                        [PSCustomObject] @{
                            File = "Source";
                            Variation = $_;
                        }
                    }
                }
            }

        # List anything remaining in $TargetHashes as these are implicitly the differences.
        if ($TargetHashes.Count -gt 0)
        {
            foreach ($Entry in $TargetHashes.GetEnumerator())
            {
                [PSCustomObject] @{
                    File = "Target";
                    Variation = $Entry.Value;
                }
            }
        }
    }
    else
    {
        throw "One or both files were not found.";
    }
}

With the output looking like:

I simply used directory listing for the two source files but it doesn't matter what format they are - so long as they're text and not binary.

Cheers,

Lain

VinayNaguru
Copper Contributor
Sep 08, 2022
Hi Lain. Wow. I will try your script too. Thank you for help me and making my work easier.

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