List all SharePoint site collections and subsites exists in particular web application using powershell script

List all SharePoint site collections and subsites exists in particular web application using powershell script

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# creates two texts file(allSites.txt, allWebs.txt) having list of all SPSites and SPWebs
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# This file is simple txt file, line separated, of the URL's for each object.
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Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue
Start-SPAssignment -Global
$siteLimit = 500
function GetAllSites([string]$webAppUrl)
{
    
    $allSites = Get-SPWebApplication $webAppUrl `
        | Get-SPSite -Limit $siteLimit | `
            ForEach-Object { $_.URL }
    $allSites
}
function GetAllWebs([string]$webAppUrl)
{
    $allWebs = Get-SPWebApplication $webAppUrl `
        | Get-SPSite -Limit $siteLimit | `
            foreach { $_.AllWebs | foreach {$_.URL } }
    $allWebs
}

$rootUrl = "Web Application URL"
"Sites"
$sites = GetAllSites $rootUrl
"Webs"
$webs = GetAllWebs $rootUrl

$sites | Out-File -FilePath "allSites.txt" -Force
$webs | Out-File -FilePath "allWebs.txt" -Force

Stop-SPAssignment -Global
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Save above code as .ps1 and run on powershell console and check two text file generated on same location.