Why does a variable disappear after one use in PowerShell in the Start-ThreadJob cmdlet?

Question

PowerShell

I am writing
Start-ThreadJob -ThrottleLimit 500 -InputObject $for_list_pc -ScriptBlock { }
Inside scriptblok, according to the documentation, I use $input to access the variable passed through -InputObject $for_list_pc. But on the second call to $input, there is nothing there. What am I doing wrong?

Answer 1

$input is a system variable and is automatically cleared when the block of work ends.
You can read more about it in the help with the Get-Help command about_Automatic_Variables