modifying script variables from another script

[ghost]

is there a way for a script to change the value of a variable in another script if that variable is public?

[manio143]

A script can modify a public field/property of another script. If they are on the same entity you can use Entity.Get<OtherScriptClass>() to obtain a reference to the other script. If they are on different entities, then you should create a field/property public OtherScriptClass {get;set;} and assign it via the editor by draggin over it an entity with the other script.