::::::::: PowerShell :::::::::
Friday, July 14, 2006
  Re-inventing the wheel for fun.
I was going through Community-Submitted Scripts Center on Microsoft TechNet and came across a script named, "BackupFiles.ps1" by Greg Lyon.

The script is functional and works.
But I didn't like the fact that it looked more like a VBScript script than a PowerShell script.
Moreover, the script was heavily utilizing a COM object instance of type "Scripting.FileSystemObject".

My goal was simply to change the code to make it look more PowerShell-like(uhm, this should mean different for different people, but in my case, i tend to use "PowerShell-Like" when a script is written mostly with built-in (cmdlets -and functions)). Nothing less, nothing more.

Re-inventing the wheel for fun.

Modified mostly "function BackupFolder" part

# BackupFiles.ps1
# Greg Lyon - July 2006
# reference: http://www.microsoft.com/technet/scriptcenter/csc/scripts/backup/backup/cscbk013.mspx
# Modified by DBMwS - July 14, 2006

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 Desitnation 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 ... "

#}}}


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Comments:
I found Greg's original version of this and it's great that you made it more "powershellish". I was playing with it and it's very easy to add an exclude pattern to this script. Just pass in a variable called something like $excludePattern and use the -exclude option on the get-childitem call.
 
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