Een introductie tot Windows PowerShell

Het onderstaande script synchroniseert twee directory's door na te gaan of alle bestanden uit de bronmap ook voorkomen in de doelmap en vice versa. Bovendien worden de tijden waarop er laatst naar een bestand geschreven werd met elkaar vergeleken en als deze afwijken, wordt het nieuwste bestand over het oudste gekopieerd.

# BackupFiles.ps1

# DBMwS

# reference: http://www.microsoft.com/technet/scriptcenter/csc/scripts/backup/backup/cscbk013.mspx



param($strSourceFolder = "C:\programming\ps\test",

$strDestinationFolder = "F:\backup\programming\ps\test")



#{{{ function BackupFolder

function BackupFolder

{

param([string] $SourceDir = $(throw 'Enter Source Directory Name'),

[string] $DestinationDir = $(throw 'Enter Destination Directory Name'))



if (! (test-path $SourceDir)) {

throw "$($SourceDir) is not a valid directory!"

}

if (! (test-path $DestinationDir)) {

throw "$($DestinationDir) is not a valid directory!"

}



# Check if destination directory is missing any files in the source

# directory.if any file is missing, copy them over to the backup dir. 

get-childitem $SourceDir |

foreach {

if ($_.PsIsContainer) {

$childDstDir = (join-path $DestinationDir $_.Name)

if (! (test-path $childDstDir)) { [void](mkdir $childDstDir) }

BackupFolder $_.FullName $childDstDir

} else {

$srcFile = $_.FullName

$destFile = join-path $DestinationDir $_.Name



if (test-path $destFile) {

$timeDiff = ($srcFile.LastWriteTime - $destFile.LastWriteTime).TotalSeconds

if ($timeDiff -gt 2) {

copy-item $srcFile $destFile -Force

write-host "Copied file $($srcFile) to $($destFile)"

$script:iCopyCount++

}

} else {

copy-item $srcFile $destFile -Force

write-host "Copied file $($srcFile) to $($destFile)"

$script:iCopyCount++

}

}

}



# Check if Source dir is missing any files on the backup dir.

# if there is/are file(s) missing, copy them over from backup dir to src dir

get-childitem $DestinationDir |

foreach {

if ($_.PsIsContainer) {

$childSrcDir = (join-path $SourceDir $_.Name)

if (! (test-path $childSrcDir)) { [void](mkdir $childSrcDir) }

BackupFolder $childSrcDir $_.FullName

} else {

$srcFile = join-path $SourceDir $_.Name

if (! (test-path $srcFile)) {

remove-item $_

write-host "Deleted file $($_)"

$script:iDestDeletedCount++

}

}

}

}

#}}}





#{{{ function WaitKey

function WaitKey {

param( [String] $strPrompt = "Press any key to continue ... ")

Write-Host

Write-Host $strPrompt -NoNewline

$key = [Console]::ReadKey($true)

Write-Host

}

#}}}





#{{{ MAIN BODY

$iCopyCount = 0

$iDestDeletedCount = 0



Write-Host

Write-Host "Backing up " -NoNewline -ForegroundColor "White"

Write-Host $strSourceFolder -ForegroundColor "Cyan" -NoNewline

Write-Host " to " -NoNewline -ForegroundColor "White"

Write-Host $strDestinationFolder -ForegroundColor "Cyan"

Write-Host





if (! (test-path $strSourceFolder)) {

Write-Host "Error: source folder does not exist!" -ForegroundColor "Red"

Write-Host

Write-Host "Exiting script"

WaitKey "Press any key to exit ... "

exit

}



if (! (test-path $strDestinationFolder)) {

Write-Host "Warning: destination folder`($($strDestinationFolder)`) does not exist"

$p = Read-Host "Create folder and continue? "

Write-Host



if ( $p[0] -ieq 'y' ) {

new-item -Type Directory -Path $strDestinationFolder | out-null

} else {

Write-Host "Exiting script"

WaitKey "Press any key to exit ... "

exit

}

}



BackupFolder $strSourceFolder $strDestinationFolder



if( ($iCopyCount -eq 0) -and ($iDestDeletedCount -eq 0) ) {

Write-Host

Write-Host "Folders are synchronized" -ForegroundColor "magenta"

} else {

Write-Host

Write-Host $iCopyCount "files copied from source to destination" -ForegroundColor "magenta"

Write-Host $iDestDeletedCount "orphaned destination files deleted" -ForegroundColor "magenta"

}



WaitKey "Press any key to exit ... "



#}}}