I'm using PowerShell To import a TAB separated file with headers. The generated file has a few empty strings "" on the end of first line of headers. PowerShell fails with an error:
"Cannot process argument because the
value of argument "name" is invalid.
Change the value of the "name"
argument and run the operation again"
because the header's require a name.
I'm wondering if anyone has any ideas on how to manipulate the file to either remove the double quotes or enumerate them with a "1" "2" "3" ... "10" etc.
Ideally I would like to not modify my original file. I was thinking something like this
$fileContents = Get-Content -Path = $tsvFileName
$firstLine = $fileContents[0].ToString().Replace('`t""',"")
$fileContents[0] = $firstLine
Import-Csv $fileContents -Delimiter "`t"
But Import-Csv is expecting $fileContents to be a path. Can I get it to use Content as a source?
You can either provide your own headers and ignore the first line of the csv, or you can use convertfrom-csv on the end like Keith says.
ps> import-csv -Header a,b,c,d,e foo.csv
Now the invalid headers in the file is just a row that you can skip.
-Oisin
If you want to work with strings instead use ConvertFrom-Csv e.g.:
PS> 'FName,LName','John,Doe','Jane,Doe' | ConvertFrom-Csv | Format-Table -Auto
FName LName
----- -----
John Doe
Jane Doe
I ended up needing to handle multiple instances of this issue. Rather than use the -Header and manually setting up each import instance I wrote a more generic method to apply to all of them. I cull out all of the `t"" instances of the first line and save the file to open as a $filename + _bak and import that one.
$fileContents = Get-Content -Path $tsvFileName
if( ([string]$fileContents[0]).ToString().Contains('""') )
{
[string]$fixedFirstLine = $fileContents[0].ToString().Replace('`t""',"")
$fileContents[0] = $fixedFirstLine
$tsvFileName = [string]::Format("{0}_bak",$tsvFileName
$fileContents | Out-File -FilePath $tsvFileName
}
Import-Csv $tsvFileName -Delimiter "`t"
My Solution if you have much columns :
$index=0
$ColumnsName=(Get-Content "C:\temp\yourCSCFile.csv" | select -First 1) -split ";" | %{
$index++
"Header_{0:d5}" -f $index
}
import-csv "C:\temp\yourCSCFile.csvv" -Header $ColumnsName
Related
I'm using PowerShell to try and get a specific field from a CSV, store it as a variable, and output it as another csv. This is mainly because I want to use it as part of a larger script, but I'm having problems...
Import-Csv C:\EmailsListNoBlanks.csv | ForEach-Object{
$Email = $_.Member -split ';'
}
$Email | Out-File C:\EmailListCOMP.csv
However in my CSV I'm only ever getting the last 4 values, whereas I'm expecting a few hundred...
Is there something I'm missing here?
Thanks
Matt
I tried something similar to what you are attempting to do and this is what I came up with to have each item on it's own line in the output:
Import-Csv C:\EmailsListNoBlanks.csv | ForEach-Object {
$Email += ($_.Member -split ';') + ("`n")
}
$Email | Out-File C:\EmailListCOMP.csv
The output is not in a csv format, but just a regular text file. The `n adds a newline to the text so that the output is one entry per line.
Try this:
Add-Type -AssemblyName System.Collections
$Email = [System.Collections.Generic.List[string]]::new()
Import-Csv C:\EmailsListNoBlanks.csv | ForEach-Object{
[void]$Email.Add( $_.Member -split ';' )
}
$Email | Out-File C:\EmailListCOMP.csv
First line of csv looks like this spaces are at after Path as well
author ,Revision ,Date ,SVNFolder ,Rev,Status,Path
I am trying to remove spaces only and rest of the content will be the same .
author,Revision,Date,SVNFolder,Rev,Status,Path
I tried below
Import-CSV .\script.csv | ForEach-Object {$_.Trimend()}
expanding on the comment with an example since it looks like you may be new:
$text = get-content .\script.csv
$text[0] = $text[0] -replace " ", ""
$csv = $text | ConvertFrom-CSV
Note: The solutions below avoid loading the entire CSV file into memory.
First, get the header row and fix it by removing all whitespace from it:
$header = (Get-Content -TotalCount 1 .\script.csv) -replace '\s+'
If you want to rewrite the CSV file to fix its header problem:
# Write the corrected header and the remaining lines to the output file.
# Note: I'm outputting to a *new* file, to be safe.
# If the file fits into memory as a whole, you can enclose
# Get-Content ... | Select-Object ... in (...) and write back to the
# input file, but note that there's a small risk of data loss, if
# writing back gets interrupted.
& { $header; Get-Content .\script.csv | Select-Object -Skip 1 } |
Set-content -Encoding utf8 .\fixed.csv
Note: I've chosen -Encoding utf8 as the example output character encoding; adjust as needed; note that the default is ASCII(!), which can result in data loss.
If you just want to import the CSV using the fixed headers:
& { $header; Get-Content .\script.csv | Select-Object -Skip 1 } | ConvertFrom-Csv
As for what you tried:
Import-Csv uses the column names in the header as property names of the custom objects it constructs from the input rows.
This property names are locked in at the time of reading the file, and cannot be changed later - unless you explicitly construct new custom objects from the old ones with the property names trimmed.
Import-Csv ... | ForEach-Object {$_.Trimend()}
Since Import-Csv outputs [pscustomobject] instances, reflected one by one in $_ in the ForEach-Object block, your code tries call .TrimEnd() directly on them, which will fail (because it is only [string] instances that have such a method).
Aside from that, as stated, your goal is to trim the property names of these objects, and that cannot be done without constructing new objects.
Read the whole file into an array:
$a = Get-Content test.txt
Replace the spaces in the first array element ([0]) with empty strings:
$a[0] = $a[0] -replace " ", ""
Write over the original file: (Don't forget backups!)
$a | Set-Content test.txt
$inFilePath = "C:\temp\headerwithspaces.csv"
$content = Get-Content $inFilePath
$csvColumnNames = ($content | Select-Object -First 1) -Replace '\s',''
$csvColumnNames = $csvColumnNames -Replace '\s',''
$remainingFile = ($content | Select-Object -Skip 1)
I filtered by date this file data1.csv
2017.11.1,09:55,1.1,1.2,1.3,1.4,1
2017.11.2,09:55,1.5,1.6,1.7,1.8,2
I don't get a header with -NoTypeInformation:
$CutOff = (Get-Date).AddDays(-2)
$filePath = "data1.csv"
$Data = Import-Csv $filePath -Header Date,Time,A,B,C,D,E
$Data2 = $Data | Where-Object {$_.Date -as [datetime] -gt $Cutoff} | convertto-csv -NoTypeInformation -Delimiter "," | % {$_ -replace '"',''}
But when rewriting with Out-File
$Data2 | Out-File "data2.csv" -Encoding utf8 -Force
I get header back as data2.csv contains:
Date,Time,A,B,C,D,E
2017.11.2,09:55,1.5,1.6,1.7,1.8,2
Why do I have Date,Time,A,B,C,D,E ?
-NoTypeInformation is not about the header but the data type of the rows in the file. Remove it to see what shows up. From Microsoft
Omits the type information header from the output. By default, the string in the output contains #TYPE followed by the fully-qualified name of the object type.
Emphasis mine.
CSVs need headers. That is why it is making one. If you don't want to see the header in the output use Select-Object -Skip 1 to remove it.
$Data |
Where-Object {$_.Date -as [datetime] -gt $Cutoff} |
ConvertTo-CSV -NoTypeInformation -Delimiter "," |
Select-Object -Skip 1 |
% {$_ -replace '"'}
I would not pipe Out-File to itself. You could pipe to Set-Content here just as well.
I am guessing this whole process is to keep the source file in the same state just with some lines filtered out based on date. You could skip most of this just by parsing the date out in each line.
$threshold = (Get-Date).AddDays(-2)
$filePath = "c:\temp\bagel.txt"
(Get-Content $filePath) | Where-Object{
$date,$null=$_.Split(",",2)
[datetime]$date -gt $threshold
} | Set-Content $filePath
Now you don't have to worry about PowerShell CSV object structure or output since we act on the raw data of the file itself.
That will take each line of the input file and filter it out if the parsed date does not match the threshold. Change encoding on the input output cmdlets as you see necessary. What $date,$null=$_.Split(",",2) is doing is splitting the line
on the comma into 2 parts. First of which becomes $date and since this is just a filtering condition we dump the rest of the line into $null.
Properly-formed CSV files must have column headers. Your use of -NoTypeInformation in generating the CSV does not affect column headers; instead, it affects whether the PowerShell object type information is included. If you Export-CSV without -NoTypeInformation, the first line of your CSV file will have a line that looks like #TYPE System.PSCustomObject, which you don't want if you're going to open the CSV in a spreadsheet program.
If you subsequently Import-CSV, the headers (Date, Time, A, B, C) are used to create the fields of a PSObject, so that you can refer to them using the standard dot notation (e.g., $CSV[$line].Date).
The ability to specify -Header on Import-CSV is essentially a "hack" to allow the cmdlet to handle files that are comma-separated, but which did not include column headers.
I'm having trouble making some changes to a series of CSV files, all with the same data structure. I'm trying to combine all of the files into one CSV file or one tab delimited text file (don't really mind), however each file needs to have 2 empty rows removed and two of the columns removed, below is an example:
col1,col2,col3,col4,col5,col6 <-remove
col1,col2,col3,col4,col5,col6 <-remove
col1,col2,col3,col4,col5,col6
col1,col2,col3,col4,col5,col6
^ ^
remove remove
End Result:
col1,col2,col4,col6
col1,col2,col4,col6
This is my attempt at doing this (I'm very new to Powershell)
$ListofFiles = "example.csv" #this is an list of all the CSV files
ForEach ($file in $ListofFiles)
{
$content = Get-Content ($file)
$content = $content[2..($content.Count)]
$contentArray = #()
[string[]]$contentArray = $content -split ","
$content = $content[0..2 + 4 + 6]
Add-Content '...\output.txt' $content
}
Where am I going wrong here...
your example file should be read, before foreach to fetch the file list
$ListofFiles = get-content "example.csv"
Inside the foreach you are getting content of mainfile
$content = Get-Content ($ListofFiles)
instead of
$content = Get-Content $file
and for removing rows i will recommend this:
$obj = get-content C:\t.csv | select -Index 0,1,3
for removing columns (column numbers 0,1,3,5):
$obj | %{(($_.split(","))[0,1,3,5]) -join "," } | out-file test.csv -Append
According to the fact the initial files looks like
col1,col2,col3,col4,col5,col6
col1,col2,col3,col4,col5,col6
,,,,,
,,,,,
You can also try this one liner
Import-Csv D:\temp\*.csv -Header 'C1','C2','C3','C4','C5','C6' | where {$_.c1 -ne ''} | select -Property 'C1','C2','C5' | Export-Csv 'd:\temp\final.csv' -NoTypeInformation
According to the fact that you CSVs have all the same structure, you can directly open them providing the header, then remove objects with the missing datas then export all the object in a csv file.
It is sufficient to specify fictitious column names, with a column number that can exceed the number of columns in the file, change where you want and exclude columns that you do not want to take.
gci "c:\yourdirwithcsv" -file -filter *.csv |
%{ Import-Csv $_.FullName -Header C1,C2,C3,C4,C5,C6 |
where C1 -ne '' |
select -ExcludeProperty C3, C4 |
export-csv "c:\temp\merged.csv" -NoTypeInformation
}
Is there any easy way how to change column position? I'm looking for a way how to move column 1 from the beginning to the and of each row and also I would like to add zero column as a second last column. Please see txt file example below.
Thank you for any suggestions.
File sample
TEXT1,02/10/2015,55.930,57.005,55.600,56.890,1890
TEXT2,02/10/2015,51.060,52.620,50.850,52.510,4935
TEXT3,02/10/2015,50.014,50.74,55.55,52.55,5551
Output:
02/10/2015,55.930,57.005,55.600,56.890,1890,0,TEXT1
02/10/2015,51.060,52.620,50.850,52.510,4935,0,TEXT2
02/10/2015,50.014,50.74,55.55,52.55,5551,0,TEXT3
Another option:
#Prepare test file
(#'
TEXT1,02/10/2015,55.930,57.005,55.600,56.890,1890
TEXT2,02/10/2015,51.060,52.620,50.850,52.510,4935
TEXT3,02/10/2015,50.014,50.74,55.55,52.55,5551
'#).split("`n") |
foreach {$_.trim()} |
sc testfile.txt
#Script starts here
$file = 'testfile.txt'
(get-content $file -ReadCount 0) |
foreach {
'{1},{2},{3},{4},{5},{6},0,{0}' -f $_.split(',')
} | Set-Content $file
#End of script
#show results
get-content $file
02/10/2015,55.930,57.005,55.600,56.890,1890,0,TEXT1
02/10/2015,51.060,52.620,50.850,52.510,4935,0,TEXT2
02/10/2015,50.014,50.74,55.55,52.55,5551,0,TEXT3
Sure, split on commas, spit the results back minus the first result joined by commas, add a 0, and then add the first result to the end and join the whole thing with commas. Something like:
$Input = #"
TEXT1,02/10/2015,55.930,57.005,55.600,56.890,1890
TEXT2,02/10/2015,51.060,52.620,50.850,52.510,4935
TEXT3,02/10/2015,50.014,50.74,55.55,52.55,5551
"# -split "`n"|ForEach{$_.trim()}
$Input|ForEach{
$split = $_.split(',')
($Split[1..($split.count-1)]-join ','),0,$split[0] -join ','
}
I created file test.txt to contain your sample data. I Assigned each field a name, "one","two","three" etc so that i could select them by name, then just selected and exported back to csv in the order you wanted.
First, add the zero to the end, it will end up as second last.
gc .\test.txt | %{ "$_,0" } | Out-File test1.txt
Then, rearrange order.
Import-Csv .\test.txt -Header "one","two","three","four","five","six","seven","eight" | Select-Object -Property two,three,four,five,six,seven,eight,one | Export-Csv test2.txt -NoTypeInformation
This will take the output file and get rid of quotes and header line if you would rather not have them.
gc .\test2.txt | %{ $_.replace('"','')} | Select-Object -Skip 1 | out-file test3.txt