Why am I getting a different result when I store in a variable my PS script?

Question

I made a Powershell script that does a foreach on a strings array and collects only some info of them. This is the code:

begin {
    $IMAGELIST = @(
    "IMAGE Srv01 something something something Srv01_999888777 something"
    "FRAG 1 something something"
    "FRAG 2 something something"
    )
}   

process {
    foreach ($LINE in $IMAGELIST) {
        if ($LINE.StartsWith("IMAGE")) {
            $IMAGELINE = $LINE.split()
            $BKP_OBJ = [pscustomobject]@{
                Server=$IMAGELINE[1]
                Id=$IMAGELINE[5]
            }
        }

        elseif ($LINE.StartsWith("FRAG")) {
            $FRAGLINE = $LINE.split()
            $BKP_OBJ | Add-Member -Force @{
                CopyNumber = $FRAGLINE[1]
            }
            Write-Output -InputObject $BKP_OBJ
        }
    }
}

When I run the script I have an output with two objects with different CopyNumber values (expected result):

PS C:\Users\db> .\BkpScript.ps1
Server            : Srv01
Id                : Srv01_999888777
CopyNumber        : 1

Server            : Srv01
Id                : Srv01_999888777
CopyNumber        : 2

If I try to store the output in a variable, I have the same CopyNumber (not expected result):

PS C:\Users\db> $myvar = .\BkpScript.ps1
PS C:\Users\db> $myvar
Server            : Srv01
Id                : Srv01_999888777
CopyNumber        : 2

Server            : Srv01
Id                : Srv01_999888777
CopyNumber        : 2

What am I doing wrong?

Answer 1

This code will create a new object whenever it shall be output/piped:

begin {
    $IMAGELIST = @(
    "IMAGE Srv01 something something something Srv01_999888777 something"
    "FRAG 1 something something"
    "FRAG 2 something something"
    )
}   

process {
    $Server = ""
    $Id = ""
    $CopyNumber = 0
    foreach ($LINE in $IMAGELIST) {
        if ($LINE.StartsWith("IMAGE")) {
            $IMAGELINE = $LINE.split()
            $Server=$IMAGELINE[1]
            $Id=$IMAGELINE[5]
        } elseif ($LINE.StartsWith("FRAG")) {
            $FRAGLINE = $LINE.split()
            $CopyNumber = $FRAGLINE[1]
            Select-Object @{n='Server'; e={$Server}}, @{n='Id'; e={$Id}}, @{n='CopyNumber'; e={$CopyNumber}} -InputObject ''
        }
    }
}

The output looks like you expect in your question:

PS C:\Users\db\Desktop> .\test.ps1

Server Id              CopyNumber
------ --              ----------
Srv01  Srv01_999888777 1
Srv01  Srv01_999888777 2


PS C:\Users\db\Desktop> $myvar = .\test.ps1
PS C:\Users\db\Desktop> $myvar

Server Id              CopyNumber
------ --              ----------
Srv01  Srv01_999888777 1
Srv01  Srv01_999888777 2