PowerShell supports constants and read-only variables.
Constants are variables that cannot be changed whatever you try.
You create a constant variable with the New-Variable command with the parameter -Option Constant.
New-Variable -Name myConst -Value "This CANNOT be changed" -Option Constant
$myConst
We can’t change te value even with the -Force parameter
New-Variable -Name myConst -Value "I'm going to change it" -Option Constant -Force
New-Variable : Cannot overwrite variable myConst because it is read-only or constant.
At line:1 char:1
+ New-Variable -Name myConst -Value "I'm going to change it" -Option Co ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : WriteError: (myConst:String) [New-Variable], SessionStateUnauthorizedAccessException
+ FullyQualifiedErrorId : VariableNotWritable,Microsoft.PowerShell.Commands.NewVariableCommand