我有一个脚本
脚本运行平稳。但是,如果我运行脚本两次,由于某些扩展名已重命名,“复制”部分将复制重复文件。 (问题仅适用于重命名的扩展名)
我想不出一种更好的方法,那就是在递归和提取基本名称并对照目标中的现有文件进行检查时获取每个文件。但是有数千个文件要处理。因此效率不高。
目录结构:
SUB2
每个月的每个日期下都有每个文件和文件夹。
这是我的复制功能之一
$threshold = 100
function Copy-1 {
$rmainingSpace = Get-FreeSpace
if($rmainingSpace -gt $threshold)
{
$Source = "source\path"
Copy-Item ($Source) -Destination "destination\path" -Filter "*.extension" -recurse -Verbose
Copy-Item ($Source) -Destination "some\other\destination\path" -Filter "*.another_extension" -recurse -Verbose
$rmainingSpace = Get-FreeSpace
}
else
{
Pause($rmainingSpace)
Copy-1
}
}
非常感谢任何人都可以提供帮助。 谢谢。
答案 0 :(得分:0)
正如Kory Gill的注释一样,我也看不到为什么要更改文件扩展名。
我的想法是,如果目标文件应该已经存在,则在文件的基本名称上添加一个序号。
实际上,如果您手动尝试复制/粘贴已经存在的文件,Windows也会建议在文件中添加序列号。
为此,此功能可能很有用:
function Copy-Unique {
# Copies files to a destination. If a file with the same name already exists in the destination,
# the function will create a unique filename by appending '(x)' after the name, but before the extension.
# The 'x' is a numeric sequence value.
[CmdletBinding()]
Param(
[Parameter(Mandatory = $true, ValueFromPipeline = $true, Position = 0)]
[Alias("Path")]
[ValidateScript({Test-Path -Path $_ -PathType Container})]
[string]$SourceFolder,
[Parameter(Mandatory = $true, Position = 1)]
[string]$DestinationFolder,
[Parameter(Mandatory = $false, Position = 2)]
[string]$Filter = '*',
[switch]$Recurse
)
# create the destination path if it does not exist
if (!(Test-Path -Path $DestinationFolder -PathType Container)) {
Write-Verbose "Creating folder '$DestinationFolder'"
New-Item -Path $DestinationFolder -ItemType 'Directory' -Force | Out-Null
}
# get a list of file FullNames in this source folder
$sourceFiles = @(Get-ChildItem -Path $SourceFolder -Filter $Filter -File | Select-Object -ExpandProperty FullName)
foreach ($file in $sourceFiles) {
# split each filename into a basename and an extension variable
$baseName = [System.IO.Path]::GetFileNameWithoutExtension($file)
$extension = [System.IO.Path]::GetExtension($file) # this includes the dot
# get an array of all filenames (names only) of the files with a similar name already present in the destination folder
$allFiles = @(Get-ChildItem $DestinationFolder -File -Filter "$baseName*$extension" | Select-Object -ExpandProperty Name)
# for PowerShell version < 3.0 use this
# $allFiles = @(Get-ChildItem $DestinationFolder -Filter "$baseName*$extension" | Where-Object { !($_.PSIsContainer) } | Select-Object -ExpandProperty Name)
# construct the new filename
$newName = $baseName + $extension
$count = 1
while ($allFiles -contains $newName) {
$newName = "{0}({1}){2}" -f $baseName, $count, $extension
$count++
}
# use Join-Path to create a FullName for the file
$newFile = Join-Path -Path $DestinationFolder -ChildPath $newName
Write-Verbose "Copying '$file' as '$newFile'"
Copy-Item -Path $file -Destination $newFile -Force
}
if ($Recurse) {
# loop though each subfolder and call this function again
Get-ChildItem -Path $SourceFolder -Directory | Select-Object -ExpandProperty Name | ForEach-Object {
$newSource = (Join-Path -Path $SourceFolder -ChildPath $_)
$newDestination = (Join-Path -Path $DestinationFolder -ChildPath $_)
Copy-Unique -SourceFolder $newSource -DestinationFolder $newDestination -Filter $Filter -Recurse
}
}
}
我还建议您对Copy-1
函数进行一些更改,以使用上述Copy-Unique
函数:
function Copy-1 {
[CmdletBinding()]
Param(
[Parameter(Mandatory = $true, Position = 0)]
[Alias("Path")]
[ValidateScript({Test-Path -Path $_ -PathType Container})]
[string]$Source,
[Parameter(Mandatory = $true, Position = 1)]
[string]$Destination,
[Parameter(Mandatory = $true, Position = 2)]
[int]$Threshold,
[string]$Filter = '*'
)
# you are not showing this function, so I have to assume it does what it needs to do
$remainingSpace = Get-FreeSpace
if($remainingSpace -gt $Threshold) {
Copy-Unique -SourceFolder $Source -DestinationFolder $Destination -Filter $Filter -Recurse -Verbose
}
else {
$answer = Read-Host -Prompt "Remaining space is now $remainingSpace. Press 'Q' to quit."
if ($answer -ne 'Q') {
# you have cleared space, and want to redo the copy action
Copy-1 -Source $Source -Destination $Destination -Filter $Filter
}
}
}
然后像这样使用它:
Copy-1 -Source 'source\path' -Destination 'destination\path' -Threshold 100 -Filter '*.extension'
Copy-1 -Source 'source\path' -Destination 'some\other\destination\path' -Threshold 100 -Filter '*.another_extension'
当然,使用相同的参数重复运行此操作,最终会得到很多副本,因为该功能不会比较文件是否相等。如果要进行真正的文件夹同步,建议您使用专用的软件或使用RoboCopy。 使用RoboCopy进行目录同步的示例几乎可以在互联网上的任何地方找到,例如here