Export-Csv emits Length and not values - powershell

Question

I want to read a CSV file and output a CSV file with only one (1) field. I have tried to create a concise example.
PS C:\src\powershell> Get-Content .\t.csv
field1,field2,field3
1,2,3
4,55,6
7,888,9
PS C:\src\powershell> Import-Csv -Path .\t.csv | `
>> ForEach-Object {
>> $_.field2 `
>> } | `
>> Export-Csv -Path .\x.csv -NoTypeInformation
>>
The problem is that the Length of field2 is written to the exported CSV file. I want the field header to be "field2" and the values to be the value from the original CSV file. Also, I only want quotes where they are required; not everywhere.
I have read Export-CSV exports length but not name and Export to CSV only returning string length. But these do not seem to address producing an actual CSV file with a header and one field value.
PS C:\src\powershell> get-content .\x.csv
"Length"
"1"
"2"
"3"

Answer 1

CSV object uses note properties in each row to store its fields so we'll need to filter each row object and leave just the field(s) we want using Select-Object cmdlet (alias: select), which processes the entire CSV object at once:
Import-Csv 1.csv | select field2 | Export-Csv 2.csv -NoTypeInformation
Note, there's no need to escape the end of line if it ends with |, {, (, or ,.
It's possible to specify several fields: select field2, field3.
To strip unneeded doublequotes, general multi-field case:
Import-Csv 1.csv |
select field2 |
%{
$_.PSObject.Properties | %{ $_.value = $_.value -replace '"', [char]1 }
$_
} |
ConvertTo-Csv -NoTypeInformation |
%{ $_ -replace '"(\S*?)"', '$1' -replace '\x01', '""' } |
Out-File 2.csv -Encoding ascii
Simplified one-field case:
Import-Csv 1.csv |
select field2 |
%{
$_.field2 = $_.field2 -replace '"', [char]1
$_
} |
ConvertTo-Csv -NoTypeInformation |
%{ $_ -replace '"(\S*?)"', '$1' -replace '\x01', '""' } |
Out-File 2.csv -Encoding ascii
A tricky case of embedded quotes inside a field was solved by temporary replacing them with a control character code 01 (there are just a few that can be used in a typical non-broken text file: 09/tab, 0A/line feed, 0D/carriage return).

Answer 2

As per WOxxOm's response, Select-Object is best way to select only field from an input and pipe to output.
Regarding the quote marks, this is a known (and frustrating) issue with PowerShell. Specifying , as the delimiter did not help.
I have gotten round it by using ConvertTo-Csv and Foreach-Object replacements. THe replacements will need to be more complex if your data contains quote marks.
Import-Csv .\1.csv |
Select-Object field2 |
ConvertTo-Csv -NoTypeInformation |
ForEach-Object {$_ -replace '"',''} |
Out-File .\2.csv