Powershell is good, but this is an extra thing you need to install. Non-standard for almost any Windows installation. So, if this is just for your own use, then powershell should be fine. If you need scripts for working on computers of the general population, for example, as part of a piece of software that you produce, this may not be the best option.
If everything is in order, you need to install an additional game, you can check cygwin. This allows you to have the full Linux bash command line and all related tools at your disposal.
If you need something included in the default Windows installation. There is a windows command line (cmd.exe). Which has some functionality, but very little compared to what is available on Linux. Another, probably the worst, problem is that there is not much documentation about it.
You may also be interested in VB Script (flame away). VB Script should work with almost any of the latest standard Windows installations and much more functional than the command line.
Kibbee
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