I have 2 files that contain strings, each string in both files is delimited by a colon. Both files share a common string and I want to be able to merge both files (based on the common string) into 1 new file.
Examples:
File1.txt
tom:mioihsdihfsdkjhfsdkjf
dick:khsdkjfhlkjdhfsdfdklj
harry:lkjsdlfkjlksdjfsdlkjs
File2.txt
mioihsdihfsdkjhfsdkjf:test1
lkjsdlfkjlksdjfsdlkjs:test2
khsdkjfhlkjdhfsdfdklj:test3
File3.txt (results should look like this)
tom:mioihsdihfsdkjhfsdkjf:test1
dick:khsdkjfhlkjdhfsdfdklj:test3
harry:lkjsdlfkjlksdjfsdlkjs:test2
$File1 = #"
tom:mioihsdihfsdkjhfsdkjf
dick:khsdkjfhlkjdhfsdfdklj
harry:lkjsdlfkjlksdjfsdlkjs
"#
$File2 = #"
mioihsdihfsdkjhfsdkjf:test1
lkjsdlfkjlksdjfsdlkjs:test2
khsdkjfhlkjdhfsdfdklj:test3
"#
# You are probably going to want to use Import-Csv here
# I am using ConvertFrom-Csv as I have "inlined" the contents of the files in the variables above
$file1_contents = ConvertFrom-Csv -InputObject $File1 -Delimiter ":" -Header name, code # specifying a header as there isn't one provided
$file2_contents = ConvertFrom-Csv -InputObject $File2 -Delimiter ":" -Header code, test
# There are almost certainly better ways to do this... but this does work so... meh.
$results = #()
# Loop over one file finding the matches in the other file
foreach ($row in $file1_contents) {
$matched_row = $file2_contents | Where-Object code -eq $row.code
if ($matched_row) {
# Create a hashtable with the values you want from source and matched rows
$result = #{
name = $row.name
code = $row.code
test = $matched_row.test
}
# Append the matched up row to the final result set
$results += New-Object PSObject -Property $result
}
}
# Convert back to CSV format, with a _specific_ column ordering
# Although you'll probably want to use Export-Csv instead
$results |
Select-Object name, code, test |
ConvertTo-Csv -Delimiter ":"
Related
Need to take my $sw CSV file and use foreach to compare that against a hash translation table $swtranslation, Key field, then output matches including the hash table's values that match into a text file.
Problem I have is it runs the search for a few minutes and returns the sw_names.txt output file with nothing in it. It should have well over 1074+ matches. My guess is my syntax or something is not right.
See code for what I have going so far.
# This is the CSV file listing all the network switches I need to run against the translation table.
$sw = Import-Csv .\AllDeviceForExport.csv -Header Host_Name, IP_Address
# Compile the switch translation table for processing and convert to hash //
$swtranslation = #{};
Import-Csv .\sw_translation.csv -Header Host_Name, DataSpace_ID | % {
$swhash[$_.Host_Name] = $_.DataSpace_ID
}
# Run the Switch listing $sw against the translation table $swtranslation
# matching the DataSpace_ID and merging DataSpace_ID and Host name and
# all other switch fields together in output //
foreach ($key in $swhash.Keys) {
$sw | Select-Object #{n="Name";e={$outputhash[$swhash.Keys($_.Host_Name).Value]}},* |
Where-Object { $_.Name -ne $null } |
Foreach { $_ -replace '--' } |
Out-File ./sw_names.txt -Force
}
Expected results:
Host_Name DataSpace_ID
ABC-123-3750-SW1 1
DEF-234-2950-SW1 5
DEF-234-2950-SW2 5
GHI-567-4510-SW1 6
GHI-567-4510-SW2 6
It's unclear what you are after.
You have two csv files without headers,
.\AllDeviceForExport.csv -Header Host_Name, IP_Address
.\sw_translation.csv -Header Host_Name, DataSpace_ID
Usually one builds a hash table from one file and iterates the other to check if there are matching properties or not.
What your code tries to do is building the hash table, iterate the keys of it and then (very inefficiently) on each key search the whole other file thwarting the whole idea.
Not knowing which files Host_Name property should be checked I suggest a different approach:
Use Compare-Object
## Q:\Test\2019\08\15\SO_57515952.ps1
# simulate $swtrans = Import-Csv .\sw_translation.csv -Header Host_Name, DataSpace_ID
$swtrans = #"
ABC-123-3750-SW1,1
DEF-234-2950-SW1,5
DEF-234-2950-SW2,5
GHI-567-4510-SW1,6
GHI-567-4510-SW2,6
"# -split '\r?\n' | ConvertFrom-Csv -Header Host_Name, DataSpace_ID
# simulate $sw = Import-Csv .\AllDeviceForExport.csv -Header Host_Name, IP_Address
$sw = #"
DEF-234-2950-SW1,192.168.234.1
DEF-234-2950-SW2,192.168.234.2
GHI-567-4510-SW1,192.168.567.1
GHI-567-4510-SW2,192.168.567.2
GHI-567-4510-SW3,192.168.567.3
"# -split '\r?\n' | ConvertFrom-Csv -Header Host_Name, IP_Address
Compare-Object -Ref $swtrans -Diff $sw -Property Host_Name -PassThru -IncludeEqual
This yields:
> Q:\Test\2019\08\15\SO_57515952.ps1
Host_Name DataSpace_ID SideIndicator
--------- ------------ -------------
DEF-234-2950-SW1 5 ==
DEF-234-2950-SW2 5 ==
GHI-567-4510-SW1 6 ==
GHI-567-4510-SW2 6 ==
GHI-567-4510-SW3 =>
ABC-123-3750-SW1 1 <=
The SideIndicator Property can be used to specify which lines to output and itself suppressed.
First line of csv looks like this spaces are at after Path as well
author ,Revision ,Date ,SVNFolder ,Rev,Status,Path
I am trying to remove spaces only and rest of the content will be the same .
author,Revision,Date,SVNFolder,Rev,Status,Path
I tried below
Import-CSV .\script.csv | ForEach-Object {$_.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'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
}
I don't know how to append a string to CSV. What am I doing:
I have two csv files. One with a list of host-names and id's and another one with a list of host-names and some numbers.
Example file 1:
Hostname | ID
IWBW140004 | 3673234
IWBW130023 | 2335934
IWBW120065 | 1350213
Example file 2:
ServiceCode | Hostname | ID
4 | IWBW120065 |
4 | IWBW140004 |
4 | IWBW130023 |
Now I read the content of file 1 in a two dimensional array:
$pcMatrix = #(,#())
Import-Csv $outputFile |ForEach-Object {
foreach($property in $_.PSObject.Properties){
$pcMatrix += ,($property.Value.Split(";")[1],$property.Value.Split(";")[2])
}
}
Then I read the content of file 2 and compare it with my array:
Import-Csv $Group".csv" | ForEach-Object {
foreach($property in $_.PSObject.Properties){
for($i = 0; $i -lt $pcMatrix.Length; $i++){
if($pcMatrix[$i][0] -eq $property.Value.Split('"')[1]){
#Add-Content here
}
}
}
}
What do I need to do, to append $pcMatrix[$i][1] to the active column in file 2 in the row ID?
Thanks for your suggestions.
Yanick
It seems like you are over-complicating this task.
If I understand you correctly, you want to populate the ID column in file two, with the ID that corresponds to the correct hostname from file 1. The easiest way to do that, is to fill all the values from the first file into a HashTable and use that to lookup the ID for each row in the second file:
# Read the first file and populate the HashTable:
$File1 = Import-Csv .\file1.txt -Delimiter "|"
$LookupTable = #{}
$File1 |ForEach-Object {
$LookupTable[$_.Hostname] = $_.ID
}
# Now read the second file and update the ID values:
$File2 = Import-Csv .\file2.txt -Delimiter "|"
$File2 |ForEach-Object {
$_.ID = $LookupTable[$_.Hostname]
}
# Then write the updated rows back to a new CSV file:
$File2 | Export-CSV -Path .\file3.txt -NoTypeInformation -Delimiter "|"
How does one access data imported from a CSV file by using dynamic note property names? That is, one doesn't know the colunm names beforehand. They do match a pattern and are extracted from the CSV file when the script runs.
As for an example, consider a CSV file:
"Header 1","Header A","Header 3","Header B"
0,0,0,0
1,2,3,4
5,6,7,8
I'd like to extract only columns that end with a letter. To do this, I read the header row and extract names with a regex like so,
$reader = new-object IO.StreamReader("C:\tmp\data.csv")
$line = $reader.ReadLine()
$headers = #()
$line.Split(",") | % {
$m = [regex]::match($_, '("Header [A-Z]")')
if($m.Success) { $headers += $m.value } }
This will get all the column names I care about:
"Header A"
"Header B"
Now, to access a CSV file I import it like so,
$csvData = import-csv "C:\tmp\data.csv"
Import-CSV will create a custom object that has properties as per the header row. One can access the fields by NoteProperty names like so,
$csvData | % { $_."Header A" } # Works fine
This obviously requires one to know the column name in advance. I'd like to use colunn names I extracted and stored into the $headers. How would I do that?
Some things I've tried so far
$csvData | % { $_.$headers[0] } # Error: Cannot index into a null array.
$csvData | % { $np = $headers[0]; $_.$np } # Doesn't print anything.
$csvData | % { $_.$($headers[0]) } # Doesn't print anything.
I could change the script like so it will write another a script that does know the column names. Is that my only solution?
I think you want this:
[string[]]$headers = $csvdata | gm -MemberType "noteproperty" |
?{ $_.Name -match "Header [a-zA-Z]$"} |
select -expand Name
$csvdata | select $headers
Choose the headers that match the condition (in this case, ones ending with characters) and then get the csv data for those headers.
the first thing ( and the only one... sorry) that came in my mind is:
$csvData | % { $_.$(( $csvData | gm | ? { $_.membertype -eq "noteproperty"} )[0].name) }
for get the first's column values and
$csvData | % { $_.$(( $csvData | gm | ? { $_.membertype -eq "noteproperty"} )[1].name) }
for second column and so on....
is this what you need?
you can use custom script to parse csv manually:
$content = Get-Content "C:\tmp\data.csv"
$header = $content | Select -first 1
$columns = $header.Split(",")
$indexes = #()
for($i; $i -lt $columns.Count;$i++)
{
# to verify whether string end with letter matches this regex: "[A-Za-z]$"
if ($column[$i] -match "[A-Za-z]$")
{
$indexes += $i
}
}
$outputFile = "C:\tmp\outdata.csv"
Remove-Item $outputFile -ea 0
foreach ($line in $content)
{
$output = ""
$rowcol = $line.Split(",")
[string]::Join(",", ($indexes | foreach { $rowcol[$_] })) | Add-Content $outputFile
}