Solved

Compare CSV files using Powershell

Posted on 2013-11-13
4
485 Views
Last Modified: 2013-11-13
I have two very large CSV files both with the following headings 'Name', FullName','Length'.
What I am looking for is a way to compare these CSV files in Powershell.

I need to know...

1) What files are unique to each set (Based purely on Name).
2) What files exist in both but whos lengths are different (Based on Name and Length).

Basically a report on what changes are represented between the two CSV files... If the results could be output to seperate files representing each type of difference that would be ideal?

This is to solve a problem where a new version of software has grown rapidly in size but the cause of the growth is unknown.
0
Comment
Question by:Blowfelt82
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 40

Expert Comment

by:footech
ID: 39644221
Let me know how the below works for you.  The output files only include the file names.  If you need it to be something else, let me know if you need help making the adjustment to the code.  Hope that all files names are unique in each .CSV, otherwise this won't work.
$file1 = Import-CSV file1.csv
$file2 = Import-CSV file2.csv
Compare-Object $file1 $file2 -Property Name | Select -ExpandProperty Name | Out-File UniqueFiles.txt
($file1 + $file2) | Group -Property Name |
 ? { $_.count -eq 2 } |
 % { Compare-Object ($_.group)[0] ($_.group)[1] -property Name,Length -passthru } |
 Select -ExpandProperty Name -ExcludeProperty SideIndicator -Unique |
 Out-File ChangedSize.txt

Open in new window

0
 

Author Comment

by:Blowfelt82
ID: 39644296
Its basically a comparison of a c:\ drive exported from a wim file, so there may well be duplicated names... Perhaps using the fullpath field would give greater acuracy?
0
 
LVL 40

Accepted Solution

by:
footech earned 500 total points
ID: 39645338
Using the fullname would avoid errors.  All you would have to do to modify the script is change each instance of "Name" to "FullName".
0
 

Author Closing Comment

by:Blowfelt82
ID: 39645462
Thanks again for your help
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Utilizing an array to gracefully append to a list of EmailAddresses
A procedure for exporting installed hotfix details of remote computers using powershell
This tutorial will teach you the core code needed to finalize the addition of a watermark to your image. The viewer will use a small PHP class to learn and create a watermark.
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)

739 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question