Replacing last characters after last comma with a string

Question

I have a huge text file which look like this:

36,53,90478,0.58699759849,0.33616,4.83449759849,0.0695335954050315,3
36,53,90478,0.58699759849,0.33616,4.8344975984         


        

Answer 1

Here's a PowerShell answer in case you like PS.

Get-Content C:\Path\To\File.csv | 
    Where{$_ -match '^(.*,)([^,]*)$'} | 
    ForEach { "{0}MI-{1}" -f $Matches[1], $Matches[2].Padleft(2,'0') } |
    Set-Content C:\Path\To\NewFile.csv