How to get the heading like this using powershell - powershell

Question

I want to get the heading as "StudentID|studentfirstname|studentlastname|class" to my existing data as below:
2|vicky|kash|A
5|abc|sdf|B
9|sdf|sdf|D
My code looks like:
add-content -path "outfile.txt" -Value (-join($StudentID, "|",`
$studentfirstname, "|",` $studentlastname, "|",`$class)
Expected output file:
StudentID|studentfirstname|studentlastname|class
2|vicky|kash|A
5|abc|sdf|B
9|sdf|sdf|D
Thanks in Advance!

Answer 1

Although I'm not quite sure what you intend to do, but to me the question reads as "I have pipe-delimited data and all it is missing is a header line".
If that is the case, you coud do something as simple as:
$fileIn = 'D:\Test\YourFile.csv'
$fileOut = 'D:\Test\YourFile2.csv'
# write the header line to a new file
Set-Content -Path $fileOut -Value "StudentID|studentfirstname|studentlastname|class"
# read the original file and append it to the one you have just created
Get-Content -Path $fileIn -Raw | Add-Content -Path $fileOut
If your input file is really large, below a faster alternative:
$fileIn = 'D:\Test\YourFile.csv'
$fileOut = 'D:\Test\YourFile2.csv'
# write the header line to a new file
Set-Content -Path $fileOut -Value "StudentID|studentfirstname|studentlastname|class"
# read the original file and append it to the one you have just created
[System.IO.File]::AppendAllText($fileOut, ([System.IO.File]::ReadAllText($fileIn)))

Answer 2

That syntax is incorrect...
Just do this...
$StudentID = '123'
$studentfirstname = 'John'
$studentlastname = 'Doe'
$class = 'Math'
Clear-Host
"$StudentID|$studentfirstname|$studentlastname|$class"
# Results
<#
123|John|Doe|Math
#>
Or
Clear-Host
$StudentID,$studentfirstname,$studentlastname,$class -join '|'
# Results
<#
123|John|Doe|Math
#>
Or
Clear-Host
"{0}|{1}|{2}|{3}" -f $StudentID,$studentfirstname,$studentlastname,$class
# Results
<#
123|John|Doe|Math
#>