如何从 CSV 中过滤 select 特定列并保存到 Powershell 中的新 csv？

Question

您好，我需要在 Powershell 中读取一个 csv 文件和 select 某些列并将其保存到新文件中。

这是我的代码

# reading the file
$import = Import-Csv -Path ($file_dir+"Myfile.csv")
# listing out all columns in csv
$import_columnname = $import | Get-member -MemberType 'NoteProperty' | Select-Object -ExpandProperty 
'Name'
# grab all columns that I need, using pattern matching
$import_columnneeded = $import_columnname | select-string -Pattern 'stringIdonotNeed|stringIdonotNeed2' -NotMatch
# select the one i need
$import | select -ExpandProperty $import_columnneeded | Export-CSV '.\whereever'

$import_columnneeded 是一个数组，它不适用于 | select -ExpandProperty、select -ExpandProperty 只适用于字符串。那么我可以对动态需要的 select 列做些什么呢？

Answer 1

如果我查看您的代码，您会希望从原始文件创建一个新的 csv 文件，同时跳过某些列。

例如，如果这是您的 CSV 中的数据

Username  Identifier Password Firstname Lastname Department  Location  
--------  ---------- -------- --------- -------- ----------  --------  
booker12  9012       12se74   Rachel    Booker   Sales       Manchester
grey07    2070       04ap67   Laura     Grey     Depot       London    
johnson81 4081       30no86   Craig     Johnson  Depot       London    
jenkins46 9346       14ju73   Mary      Jenkins  Engineering Manchester
smith79   5079       09ja61   Jamie     Smith    Engineering Manchester

你可以用这个

# a regex string that contains all headers you don't want combined with regex OR '|'
$notNeeded = 'Password|Location|Identifier'

$file_dir = 'D:\Test'
$fileIn   = Join-Path -Path $file_dir -ChildPath "MyFile.csv"
$fileOut  = Join-Path -Path $file_dir -ChildPath "MyNewFile.csv"

# import the original file
$import = Import-Csv -Path $fileIn

# get an array of column headers excluding the ones you don't want
$columns = $import[0].PSObject.Properties.Name | Where-Object { $_ -notmatch $notNeeded }

# output a new csv file with all remaining headers
$import | Select-Object $columns | Export-Csv -Path $fileOut -NoTypeInformation

生产：

Username  Firstname Lastname Department 
--------  --------- -------- ---------- 
booker12  Rachel    Booker   Sales      
grey07    Laura     Grey     Depot      
johnson81 Craig     Johnson  Depot      
jenkins46 Mary      Jenkins  Engineering
smith79   Jamie     Smith    Engineering

如何从 CSV 中过滤 select 特定列并保存到 Powershell 中的新 csv？

How to filter select certain column from CSV and save to new csv in Powershell?

csv

powershell

automation