[英]Check if a file exists or not in Windows PowerShell?
我有这个脚本,它比较磁盘两个区域中的文件,并将最新的文件复制到具有较旧修改日期的文件上。
$filestowatch=get-content C:\H\files-to-watch.txt
$adminFiles=dir C:\H\admin\admin -recurse | ? { $fn=$_.FullName; ($filestowatch | % {$fn.contains($_)}) -contains $True}
$userFiles=dir C:\H\user\user -recurse | ? { $fn=$_.FullName; ($filestowatch | % {$fn.contains($_)}) -contains $True}
foreach($userfile in $userFiles)
{
$exactadminfile= $adminfiles | ? {$_.Name -eq $userfile.Name} |Select -First 1
$filetext1=[System.IO.File]::ReadAllText($exactadminfile.FullName)
$filetext2=[System.IO.File]::ReadAllText($userfile.FullName)
$equal = $filetext1 -ceq $filetext2 # case sensitive comparison
if ($equal) {
Write-Host "Checking == : " $userfile.FullName
continue;
}
if($exactadminfile.LastWriteTime -gt $userfile.LastWriteTime)
{
Write-Host "Checking != : " $userfile.FullName " >> user"
Copy-Item -Path $exactadminfile.FullName -Destination $userfile.FullName -Force
}
else
{
Write-Host "Checking != : " $userfile.FullName " >> admin"
Copy-Item -Path $userfile.FullName -Destination $exactadminfile.FullName -Force
}
}
这里是files-to-watch.txt的格式
content\less\_light.less
content\less\_mixins.less
content\less\_variables.less
content\font-awesome\variables.less
content\font-awesome\mixins.less
content\font-awesome\path.less
content\font-awesome\core.less
我想修改它,以便在两个区域中都不存在该文件并打印警告消息时避免这样做。 有人能告诉我如何使用 PowerShell 检查文件是否存在吗?
只是为了提供Test-Path
cmdlet 的替代方案(因为没有人提到它):
[System.IO.File]::Exists($path)
做(几乎)同样的事情
Test-Path $path -PathType Leaf
除了不支持通配符
使用测试路径:
if (!(Test-Path $exactadminfile) -and !(Test-Path $userfile)) {
Write-Warning "$userFile absent from both locations"
}
将上面的代码放在你的ForEach
循环中应该做你想要的
您想使用Test-Path
:
Test-Path <path to file> -PathType Leaf
查看文件是否存在的标准方法是使用Test-Path
cmdlet。
Test-Path -path $filename
您可以使用Test-Path
cmd-let。 所以像...
if(!(Test-Path [oldLocation]) -and !(Test-Path [newLocation]))
{
Write-Host "$file doesn't exist in both locations."
}
cls
$exactadminfile = "C:\temp\files\admin" #First folder to check the file
$userfile = "C:\temp\files\user" #Second folder to check the file
$filenames=Get-Content "C:\temp\files\files-to-watch.txt" #Reading the names of the files to test the existance in one of the above locations
foreach ($filename in $filenames) {
if (!(Test-Path $exactadminfile\$filename) -and !(Test-Path $userfile\$filename)) { #if the file is not there in either of the folder
Write-Warning "$filename absent from both locations"
} else {
Write-Host " $filename File is there in one or both Locations" #if file exists there at both locations or at least in one location
}
}
测试路径可能会给出奇怪的答案。 例如,“Test-Path c:\\temp\\ -PathType Leaf”给出假,但“Test-Path c:\\temp* -PathType Leaf”给出真。 伤心:(
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