If I understand your question, you are trying to find a drive letter you can pass to "net use" to map.

My suggestion is that you let "net use" figure that out, ane let you know what it mapped.

The syntax "net use * \\UNC\PATH" will pick an available drive letter.

You can scan the output of that command to discover what drive it used. eg: 

>net use * \\myserver\pub\MyPath
Drive Y: is now connected to \\myserver\pub\MyPath.

The command completed successfully.

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                Memory fault   --   brain fried

In reply to Re: perl robocopy to temp mapped drive. by NetWallah
in thread perl robocopy to temp mapped drive. by 3dbc

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