Chad Callihan smooshes files together:
I recently had a handful of CVS files that needed reviewed. Each CSV file was the same format, and while I could have opened them each individually to sort and review, I thought it would be much easier to combine them into one file. It was time to turn to PowerShell. Let’s look at a few examples of how PowerShell can be used to combine multiple CSV files into a single file.
A core assumption here is that the structure of each file—particularly the number of columns but also the semantic meaning of each column—is the same.