replace-in-files.ps1

<#
.SYNOPSIS
	Search and replace a pattern in the given files by the replacement
.DESCRIPTION
	This PowerShell script searches and replaces a pattern in the given files by the replacement.
.PARAMETER pattern
	Specifies the pattern to look for
.PARAMETER replacement
	Specifies the replacement
.PARAMETER files
	Specifies the file to scan
.PARAMETER recursive
	flag to search recursively
.EXAMPLE
	PS> ./replace-in-files NSA "No Such Agency" C:\Temp\*.txt -recursive
.LINK
	https://github.com/fleschutz/PowerShell
.NOTES
	Author: Markus Fleschutz | License: CC0
#>

param(
    [string]$pattern = "", 
    [string]$replacement = "", 
    [string]$files = "", 
    [switch]$recursive = $false
)

function ReplaceInFile { 
    param(
        [string]$FilePath, 
        [string]$Pattern, 
        [string]$Replacement
    )

    [System.IO.File]::WriteAllText($FilePath,
        ([System.IO.File]::ReadAllText($FilePath) -replace $Pattern, $Replacement)
    )
}

try {
	if ($pattern -eq "" ) { $pattern = read-host "Enter search pattern" }
	if ($replacement -eq "" ) { $replacement = read-host "Enter replacement" }
	if ($files -eq "" ) { $files = read-host "Enter files" }

	$StopWatch = [system.diagnostics.stopwatch]::startNew()

    if ($recursive) {
	    $fileList = (get-childItem -path "$files" -file -recurse)
    }
    else {
        $fileList = (get-childItem -path "$files" -file)
    }
	foreach($file in $fileList) {
		ReplaceInFile $file $pattern $replacement
	}
	[int]$Elapsed = $StopWatch.Elapsed.TotalSeconds
	"OK, replaced '$pattern' by '$replacement' in $($fileList.Count) files in $Elapsed sec."
	exit 0 # success
} catch {
	"⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
	exit 1
}