[英]Replace string in an imported CSV file
I need to import a CSV file and then replace full usernames domain\\username
with username
. 我需要导入CSV文件,然后将完整的用户名domain\\username
替换为username
。
The following lines work but I only receive the amended usernames as the output and not the full file. 以下几行有效,但我只收到修改后的用户名作为输出,而不是完整文件。
Could you please advise? 您能否提一些建议?
$TestFile = Import-Csv .\file.csv
$NewFile = $TestFile | ForEach-Object {$_."Username" -replace 'domain\\',''}
When processing CSV input with a ForEach-Object
loop you need to output the data back to the pipeline. 使用ForEach-Object
循环处理CSV输入时,您需要将数据输出回管道。 Also, the -replace
operator doesn't modify variables or properties in-place. 另外, -replace
运算符不会就地修改变量或属性。 It takes the value, does the work, and outputs the modified string to the success output stream. 它获取值,执行工作,然后将修改后的字符串输出到成功输出流。 If you want to update a property you need to assign the modified value back to that property. 如果要更新属性,则需要将修改后的值分配回该属性。
Change this: 更改此:
$TestFile = Import-Csv .\file.csv
$NewFile = $TestFile | ForEach-Object {$_."Username" -replace 'domain\\',''}
into this: 到这个:
$NewFile = Import-Csv .\file.csv | ForEach-Object {
$_.Username = $_.Username -replace 'domain\\', '' # update username
$_ # feed data back into the pipeline
}
and the code will do what you want. 然后代码将执行您想要的操作。
Here's one way - get the column names from the input table, iterate each row in the table, and output new custom objects with needed changes. 这是一种方法-从输入表中获取列名,迭代表中的每一行,然后输出具有所需更改的新自定义对象。
$table = Import-Csv "Test.csv"
# Get column names
$columnNames = ($table | Select-Object -First 1).PSObject.Properties |
Select-Object -ExpandProperty Name
# Iterate each row in the table
foreach ( $row in $table ) {
$outputObject = New-Object PSObject
foreach ( $columnName in $columnNames ) {
if ( $columnName -eq "Username" ) {
$outputObject | Add-Member NoteProperty "Username" ($row.Username.Split('\')[1])
}
else {
$outputObject | Add-Member NoteProperty $columnName $row.$columnName
}
}
$outputObject
}
To create a new CSV file as output, put the above code in a script and pipe to Export-Csv
. 要创建一个新的CSV文件作为输出,请将上面的代码放入脚本中,并通过管道传递到Export-Csv
。
You can perform the replace on the string data, then convert it into an object using ConvertFrom-Csv
. 您可以对字符串数据执行替换,然后使用ConvertFrom-Csv
将其转换为对象。
$TestFile = (Get-Content .\file.csv) -replace 'domain\\',''
$NewFile = ConvertFrom-Csv $TestFile
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