Compare two large txt file and return differences using PowerShell or C#

Question

I have to compare two large files and return the difference of 2 files

$result= Compare-Object -ReferenceObject $(Get-Content D:\Scalability\misc\1.txt) -DifferenceObject $(Get-Content D:\Scalability\misc\1.txt) | Select -Property InputObject
$result.InputObject

above code working for the small file only and file size are 1GB

And what is your questiopn? What did you try? There are so many similar questions around, even complete tools that do it for you. — MakePeaceGreatAgain
– MakePeaceGreatAgain, Commented Apr 3, 2019 at 6:57
For clarity, please add in details like what you are trying to achieve, what problem you are running into, the output you are getting and the expected output. Also include what you have already tried and what you have already read / researched so we don't duplicate efforts here. — Ross Lyons
– Ross Lyons, Commented Apr 3, 2019 at 7:24
Hi I want to compare 2 big files and i want difference given 2 file using powershell script or C# — Mahesh Gaikwad
– Mahesh Gaikwad, Commented Apr 3, 2019 at 7:36

Piotr Stapp · Accepted Answer · 2019-04-03 07:55:56Z

1

Use FC command like below:

FC /a C:\demo\input.txt H:\work\output.txt

/a is for ASCII compare

p.s FC stands for file compare

p.s More in the docs: https://ss64.com/nt/fc.html

p.s in powershell we have to write fc.exe or even full path C:\windows\system32\fc.exe because FC is an alias in PowerShell

edited Apr 3, 2019 at 7:55

answered Apr 3, 2019 at 7:18

Piotr Stapp

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6 Comments

Mahesh Gaikwad Over a year ago

FC /a D:\Scalability\misc\1.txt D:\Scalability\misc\2.txt Format-Custom : A positional parameter cannot be found that accepts argument 'D:\Scalability\misc\1.txt'. At line:1 char:1 + FC /a D:\Scalability\misc\1.txt D:\Scalability\misc\2.txt + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidArgument: (:) [Format-Custom], ParameterBindingException + FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.PowerShell.Commands.FormatCustomCommand

Piotr Stapp Over a year ago

write fc.exe instead

Piotr Stapp Over a year ago

@MaheshGaikwad I updated answer it is because Powershell has an Alias FC for the Format-Custom cmdlet, therefore to run the 'old' FC under PowerShell you need to run fc.exe or full path to fc.exe

Mahesh Gaikwad Over a year ago

Thanks, But i want only different lines from 2 txt file. below is result if i use above code C:\windows\system32\fc.exe /a D:\Scalability\misc\1.txt D:\Scalability\misc\2.txt Comparing files D:\SCALABILITY\MISC\1.txt and D:\SCALABILITY\MISC\2.TXT ***** D:\SCALABILITY\MISC\1.txt 6 8 10 ***** D:\SCALABILITY\MISC\2.TXT 6 ... 10 *****

Mahesh Gaikwad Over a year ago

File 1 have lines 1 2 3 4 5 6 8 10 11 12 and File 2 have 1 2 3 4 5 6 7 8 9 10 11 12 i want result 7 and 9 line which are not exits in file 1

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