Write oracle scripts in .bach file

hi every body
I have to change a table and add a column in a database ...(alter table "x" add column .....)
but my problem is that I have to change some other instances of this database in other cities ....so I have to write some thing like .batch file and I will send it and run this in the destination place .....plz help me ....is it possible and how?

it is very important for me and I my program in other city is fail without this field :((