批量到PowerShell语言转换-Java 学习之路

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我在DOS下的批处理脚本是处理缓慢的方式，所以有人推荐我使用PowerShell . 我第一次在Windows上运行它，但是我从来没有在今天之前使用它 . 我听说它类似于批处理脚本，所以我目前正在将我的批处理脚本转换为PowerShell脚本 . 到目前为止，下面是我的脚本转换的一半：

# ask user for network share and file that they would like to search
$textFilePath = Read-Host Please enter filesystem location of "filenames.txt". Include drive letter or // at start of path
$uncPath = Read-Host Please enter the UNC path you would like to search. Include // at start of path.

# REM check if network path is available. If it is, search network directory for files with same name as the strings in filenames.txt
IF (Test-Path %uncPath%) {
    echo Network Path Exists. Searching %uncPath% for files with same name and extension as filenames in the filenames.txt file 
    for (/r %uncPath% %%G IN (*)) {for (/F "tokens=*" %%i in (%textFilePath%)) {if (%%~nxG==%%i) {echo %%~nxG,%%~fG >> filenamesOutput.txt}}}
    pause
}

IF (!(Test-Path exist %uncPath%)) {
    echo File not found
    GOTO:userInput
}

我正在学习powershell命令，并将批处理命令更改为powershell . 转换的帮助将不胜感激 .

编辑后：

这是我原来的批处理脚本：

@echo off

echo Please enter filesystem location of "filenames.txt". (Include Drive letter or // at start of path)
set /p textFilePath=Enter The Value:%=%
:userInput
REM ask user for network share and file that they would like to search
echo Please enter the UNC path you would like to search. (Include // at start of path)
set /p uncPath=Enter The Value:%=%

REM check if network path is available. If it is, search network directory for files with same name as the strings in filenames.txt
IF exist %uncPath% (
    echo Network Path Exists. Searching %uncPath% for files with same name and extension as filenames in the filenames.txt file
    for /r %uncPath% %%G IN (*) DO for /F "tokens=*" %%i in (%textFilePath%) DO if %%~nxG==%%i echo %%~nxG,%%~fG >> filenamesOutput.txt
    pause
)

IF NOT exist %uncPath% (
    echo File not found
    GOTO:userInput
)

第二次编辑后：

$VerbosePreference = "continue"

# ask user for network share and file that they would like to search
$textFilePath = Read-Host Please enter filesystem location of     "filenames.txt". Include drive letter or // at start of path
$uncPath = Read-Host Please enter the UNC path you would like to search. Include // at start of path.

# check if network path is available. If it is, search network directory for     files with same name as the strings in filenames.txt
IF (Test-Path $uncPath){
    echo "Network Path Exists. Searching $uncPath for files with same name and extension as filenames in the filenames.txt file"
    foreach($file in Get-ChildItem $uncPath -Recurse) {
        # Get-Content reads in a file, line by line
        foreach($line in Get-Content $_.FullName) {
            # if goes in here
            if($file.Name -eq $line){
                echo $file.Name
                "{0},{1}" -f $file.Name,$file.FullName | Out-File filenamesOutput2.txt -Append
            }
        }
    }
Write-Host -NoNewLine 'Press any key to continue...';
$null = $Host.UI.RawUI.ReadKey('NoEcho,IncludeKeyDown');
}



IF (!(Test-Path $uncPath)){
    echo "UNC path not found"
    Write-Host -NoNewLine 'Press any key to continue...';
    $null = $Host.UI.RawUI.ReadKey('NoEcho,IncludeKeyDown');
}

1 回答

变量：

在PowerShell中，变量引用始终以_1664265为前缀（非常类似于PHP或Perl） .

因此，您将在cmd / batch中分配和取消引用的任何变量如下：

set /p varname= somevalue
echo %varname%

将PowerShell视为（注意分配和解除引用之间没有区别）：

$varname = "varvalue"
Write-Host $varname

所以 exists / Test-Path 语句应该是：

if(Test-Path $uncPath){
    # Loops in here
    # "#" starts is a single-line comment btw
}

For循环：

在cmd中， for 循环结构的行为会有所不同，具体取决于第一个开关：

for /r 粗略表示"loop recursively through filesystem tree"
for /f 粗略表示"loop through tokens in a file"

应该注意的是，cmd for循环使用参数，由前缀 %% 表示（在示例中类似于 %%G 或 %%i ）

PowerShell没有这个概念，只是在循环中使用变量 . 因此，您的 for /r 和 for /f 循环变为：

# Get-ChildItem is equivalent to the "dir" command
# The -Recurse is pretty self-explanatory ( = /S) 
foreach($file in Get-ChildItem $uncPath -Recurse) {
   # Get-Content reads in a file, line by line
   foreach($line in Get-Content $textFilePath) {
        # if goes in here
    }
}

参数修饰符：

在cmd中，参数（如 %%G ）可以是modified using a tilde (~)，后跟一系列修饰符 .

%%~nG 表示“将 %%G 视为路径，返回不带扩展名的名称”
%%~xG 表示“将 %%G 视为路径，返回文件扩展名”

所以 %%~nxG 自然就是"return filename WITH extension" .

在PowerShell中，一切都是.NET对象，在 $file 的情况下，它是一个FileInfo对象 . 从 FileInfo 对象，文件名（带扩展名）存储在 Name 属性中，因此您的 if 语句：

if %%~nxG==%%i

变为：

if($file.Name -eq $line){
    # echo and output goes in here
}

%%~fG 表示“将 %%G 视为路径，给我完整的根路径”

同样， $file 是 FileInfo 对象的事实派上用场，可以从 FullName 属性访问完整路径：

"{0},{1}" -f $file.Name,$file.FullName | Out-File filenamesOutput.txt -Append

-f 运算符是String.Format的简化语法快捷方式，.NET的版本为 sprintf ，如果愿意的话 .

最终导致类似于：

# ask user for network share and file that they would like to search
$textFilePath = Read-Host 'Please enter filesystem location of "filenames.txt". Include drive letter or \\ at start of path'
$uncPath = Read-Host 'Please enter the UNC path you would like to search. Include \\ at start of path.'

# check if network path is available. If it is, search network directory for files with same name as the strings in filenames.txt
if (Test-Path $uncPath) {
    Write-Host "Network Path Exists. Searching $uncPath for files with same name and extension as filenames in the filenames.txt file"

    foreach($file in Get-ChildItem $uncPath) {
        foreach($line in Get-Content $textFilePath) {
            if($file.Name -eq $line){
                '"{0}","{1}"' -f $file.Name,$file.FullName | Out-File filenamesOutput.txt -Append
            }
        }
    }
    pause
} else {
    Write-Host "File not found"
}

回复于 2024-04-27T18:04:09+08:00

批量到PowerShell语言转换

1 回答

变量：

For循环：

参数修饰符：

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