linux - How to use Control as modifier with xmodmap?

So I'm trying to create a combination of keys to generate ISO keys for the Portuguese layout, the key in question is the < >, pressing it will normally generate the < character, < > + Shift will generate the > character. So I'm trying to create a combination using xmodmap, and I want this to work for all the programs. I've been searching on Google and came up with this example for Control + P = Up:

xmodmap -e "keycode 33 = p P Up"

keycode 33 matches p, so where does Control come up in that command?

What I want is:

map Control + , to >

map Control + . to <

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