These are files of course evaluations and the value in the parentheses is the instructor id. For most courses this is just one person but for some there are 2 or 3. The value in parens would then ...

Thus, you can run PowerShell cmdlets and scripts, console applications, Windows programs, batch files, or any other sort of program from the PowerShell environment. notepad still starts Notepad.

Like Cmd batch files, PowerShell scripts are basically a series of cmdlets strung together. PowerShell does have a more advanced scripting language, but it still only has a dozen or so constructs ...

In the Mac and Unix/Linux worlds, batch files are "shell scripts" and use a .SH extension. See batch file abc's, cmd abc's, PowerShell, command line and shell script.

PowerShell does have a more advanced scripting language, but it still only has a dozen or so constructs for things like If/Then decisions and loops. Consequently, the language is pretty easy to learn.