how to blend these txt lines in a random way?

Sort by random.

Example:

$list = "john","john1","john123","miami","miami3","miami@1"
$list = $list | Sort-Object {Get-Random}


foreach ($item in $list)
{
    Write-Host $item
}

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Nice @Dustin, and way better / shorter than anything hacked together in a DOS BAT approach.

I'm also not aware of any Windows non scripting tools (like SORT.EXE) that have any capability to randomize the output when "sorting".

~bp

for WINDOWS OS please..and for BIGFILE.TXT
thank you

You can use Get-Content and the path to the file to get the list from text.

$list = Get-Content "C:\test\list.txt"
$list = $list | Sort-Object {Get-Random}


foreach ($item in $list)
{
    Write-Host $item
}

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If you want to randomize and write the changes back to your text file, use:

$list = Get-Content "C:\test\list.txt"
$list = $list | Sort-Object {Get-Random}
Set-Content "C:\test\list.txt" $list

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Or if you want to write to another file, just change the path after 'Set-Content'

And just to clarify, this is a WINDOWS OS solution using Powershell.  You can save the script shown above as a .ps1 file, and then run it from a command line or a batch file by doing:

powershell.exe -ExecutionPolicy Bypass -File EE28977195.ps1

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~bp

working perfect but can u add please OUTPUT.TXT ??

great, thank you...