cmpobj_sample.ps1

PS D:\> $Indicator = @{ '=>' = 'Right'; '<=' = 'Left'; '==' = 'Same' }
>>> $Indicator

Name                           Value
----                           -----
==                             Same
<=                             Left
=>                             Right

PS D:\> $c1 = import-csv d:\c1 -delim "`t"
>>> $c1

Name Value
---- -----
a1   v1
a2   v2
a3   v3


PS D:\> $c2 = import-csv d:\c2 -delim "`t"
>>> $c2

Name Value
---- -----
a1   vb2
b2   vb2
b3   v3


PS D:\> Compare-Object -IncludeEqual $c1 $c2 -Property Name | Select-Object Name, Value, @{Label = 'SideIndicator'; Expression = { $Indicator[$_.SideIndicator] } }
>>>

Name Value SideIndicator
---- ----- -------------
a1         Same
b2         Right
b3         Right
a2         Left
a3         Left
PS D:\> Compare-Object -IncludeEqual $c1 $c2 -Property Name -PassThru | Select-Object *, @{Label = 'Side'; Expression = { $Indicator[$_.SideIndicator] } }
>>>

Name Value SideIndicator Side
---- ----- ------------- ----
a1   v1    ==            Same
b2   vb2   =>            Right
b3   v3    =>            Right
a2   v2    <=            Left
a3   v3    <=            Left