Update-StringInFile.ps1
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function Update-StringInFile { <# .SYNOPSIS Updates (replaces) all occurrences of a given string in a file with a new value; the file is overwritten in place .PARAMETER FilePath Path to the file to update .PARAMETER OldString String to replace with $NewString .PARAMETER NewString New string to use as replacement for $OldString .PARAMETER MatchCase Treat $OldString as case sensitive .PARAMETER Force Suppress confirmation prompt .EXAMPLE Update-StringInFile -FilePath c:\temp\myfile.txt -OldString 'replace me!' -NewString 'new value' This command replaces all occurrences of OldString with NewString in c:\temp\myfile.txt .EXAMPLE dir c:\temp\*.txt | Update-StringInFile -OldString 'replace me!' -NewString 'new value' This command replaces OldString with NewString in all files received from the pipeline #> [CmdletBinding(SupportsShouldProcess, DefaultParameterSetName = 'outputfolder')] param( [parameter(Mandatory, Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName)] [Alias('Fullname', 'Path')] [ValidateScript( { if (!(Test-Path -Path $_)) { throw "Invalid path: $_" } })] [ValidateScript( { if (!(Test-Path -Path $_ -PathType 'Leaf')) { throw "FilePath must be a file: $_" } })] [string[]]$FilePath, [parameter(Mandatory, Position = 1)] [string]$OldString, [parameter(Mandatory, Position = 2)] [string]$NewString, [parameter()] [switch]$MatchCase, [parameter()] [switch]$Force ) process { foreach ($file in $FilePath) { Write-Verbose -Message "Working on $file" [bool]$updateFile = $false if (Select-String -Path $file -Pattern $OldString -CaseSensitive:$MatchCase -SimpleMatch) { Write-Verbose "Match found" $updateFile = $true } else { Write-Verbose "No match found, skipping" continue } $newContent = $null $oldContent = Get-Content -Path $file if ($MatchCase) { $newContent = $oldContent.Replace($OldString, $NewString) } else { $newContent = $oldContent | ForEach-Object { $_.replace($OldString, $NewString) } } if ($updateFile -and $PSCmdlet.ShouldProcess("$file", "Overwrite file")) { if ($updateFile -and ($Force -or ($PSCmdlet.ShouldContinue("Overwrite $file?", "Overwriting $file")))) { Write-Verbose -Message "Updating $file" Set-Content -Path $file -Value $newContent -Force } else { $newContent } } } } } |