Does not print?

That's because they are blank (see you definitions on lines 13 - 17)

The if isn't ever firing. You can check this yourself with code like this:

...

for i = 1, #CmdStyles do
    if CommandStyle == CmdStyles[i] then
        print("It worked at",i)
        CommandSeperator = CmdStyles[i].CmdSep
        ...
    end
end

At seeing that it doesn't work, you could check what each comparison is seeing:

for i = 1, #CmdStyles do
    print(CommandStyle, "==", CmdStyles[i])
    if CommandStyle == CmdStyles[i] then
        CommandSeperator = CmdStyles[i].CmdSep
        ...
    end
end

And you'll see absolutely nothing -- this means the for loop isn't working.

Let's print out #CmdStyles, and we'll get 0.

The way you have defined CmdStyles, it has indices like "Plain" which are not numbers and don't contribute to table length (#). That also means that a for loop using i = 1, #CmdStyles won't work, since no numbers are keys in CmdStyles

You should use a pairs loop to fix this:

for i, c in pairs(CmdStyles) do
    if CommandStyle == c then
        CommandSeperator = c.CmdSep
        ...
    end
end

However, you'll see that that doesn't work (and a print will verify that the if is never happening).

We can compare the values in each step of the for loop like before, and get

Plain   ==  table: 0x9ce870
Plain   ==  table: 0x9cd380
Plain   ==  table: 0x9cf5d0
Plain   ==  table: 0x9cd430
Plain   ==  table: 0x9cec90

We should actually be comparing to i, the index:

if CommandStyle == i then

Alternatively, since we're just looking for a particular value, you don't need the loop at all:

local style = CmdStyles[ CommandStyle ]

local CommandSeperator = style.CmdSep
local ComputerKey = style.CmpKey
...