how do i use a variable from one script in another script?

[merry hedge]

so im making a fighting game, and i want you to be able to select an attack to use, but you can only use one attack at a time. and its gonna be determined by a gui button and a script under it, and im just wondering, how do i get the attack type variable on the other script for the actual attack function?

[thick gull]

either use a module or a value instance