Question: What's the best method to delete the first line of text from a large (10k+) group of text files.

Answer: 
If PowerShell isn't an option, you can use the `more` command:

```
more [file] +2 > [new file]

```

Stick that in a `for` loop that also then renames `[new file]` to `[file]` and you'll have the file minus the first line.

Not pretty, but should work.
If using PowerShell is an option you could adopt from this post: [Remove Top Line of Text File with Powershell](https://stackoverflow.com/questions/2074271/remove-top-line-of-text-file-with-powershell)