PowerShell - Compare between 2 sizes of files and return true only if the change is up to 10%-CodePudding

I have a script that get the size of each file in KB, I want to return true only if the delta between them up to 10%

Example1:

$file1 = 100 KB
$file2 = 110 KB

In this case I need to get true

Example2:

$file1 = 90 KB
$file2 = 110 KB

This should return false

Maybe someone can help me with a command that can solve it

CodePudding user response：

Here's a good start to solve your comparison question.

You've got to calculate the different using some math.

#!/usr/bin/env powershell

#get the two files
$hassize = '{0}.name has a size of {1}'
$file1 = Get-Item -Path "$env:HOMEDRIVE/Powershell/Scripts/dchero.ps1"
$file2 = Get-Item -Path "$env:HOMEDRIVE/Powershell/Scripts/findinstaller.ps1"

#measure their individual sizes
Write-Output -InputObject ($hassize -f $file1.name,$file1.Length)
Write-Output -InputObject ($hassize -f $file2.name,$file2.Length)

##calculate the size difference
$diff =[math]::Round( ( 100 * ($file1.Length - $file2.Length) / (($file1.Length - $file2.Length) / 2)),5)
Write-Output -InputObject ("That's a {0}% difference!" -f $diff)

Now that you've calculated the difference you can use an if/else loop to determine the output.

if ($diff -gt 10) {

  ## the "10" ^ here represents the number 10 literally
  ## the input from $diff will be 
  ## an integer that represents a % of change

  Write-Output -InputObject ('Turns outs {0} is bigger than 10!' -f $diff)
}
Else {
  Write-Output -InputObject ('Turns outs {0} is smaller than 10!' -f $diff)
}

CodePudding user response：

The most basic solution would be something like this:

$file1 = 100KB
$file2 = 110KB

if ($file2 -ge ($file1 * 1.1)) {
    "file2 is at least 10% bigger than File1"
}